2013 Porsche 911 Reviews, Pricing & Specs

Air Conditioning

Active charcoal air filtration · Automatic climate control front air conditioning · Dual front air conditioning zones

Airbags

Dual front airbags · Passenger airbag deactivation: occupant sensing deactivation · Front side airbags · Front side curtain airbags

Audio System

Antenna Type: diversity · Bluetooth auxiliary audio input · Single disc in-Dash CD · MP3 player: CD MP3 Playback · HD radio · Total Number of Speakers: 9 · 235 watts

Brakes

ABS: 4-wheel · Front brake diameter: 13.4 · Front brake width: 1.34 · Front brakes: ventilated disc · Rear brake diameter: 13.0 · Rear brake width: 1.1 · Rear brakes: ventilated disc

Comfort Features

Center console trim: leather · Dash trim: leather · Door trim: leather · Floor Mat Material: carpet · Floor Material: carpet · Floor Mats: front · Foot pedal trim: stainless steel · Shift knob trim: leather · Steering wheel trim: leather

Convenience Features

Assist handle: front · Center console: front console with storage · Cupholders: front · Dimming rearview mirror: auto-dimming · Multi-function remote: trunk release · One-touch windows: 2 · Power outlet(s): 12V front · Power steering: speed-proportional · Power windows: lockout button · Reading lights: front · Steering wheel: tilt and telescopic · Steering wheel mounted controls: cruise controls · Storage: door pockets · Vanity mirrors: dual illuminating

Driver Seat

Manual adjustments: 2 · Power adjustments: 4

Drivetrain

4WD Type: full time · Limited slip differential: center

Exterior Features

Door handle color: body-color · Exhaust: dual exhaust tips · Exhaust tip color: stainless-steel · Front bumper color: body-color · Grille color: black · Mirror color: body-color · Rear bumper color: body-color · Rear spoiler: electronically controlled · Rear spoiler color: body-color · Window trim: black

Headrests

Front headrests: adjustable · Number of front headrests: 2

In Car Entertainment

Infotainment screen size: 7 in.

Instrumentation

Fuel economy display: MPG · Instrument cluster screen size: 4.6 in. · Warnings and reminders: coolant temperature warning

Lights

Daytime running lights: LED · Headlights: auto delay off · Tail and brake lights: LED

Mirrors

Exterior mirrors: heated

Passenger Seat

Manual Adjustments: 2 · Power adjustments: 4

Rear Seats

Type: bucket

Roof

Moonroof: one-touch open/close

Safety

Active head restraints: driver · Crumple zones: rear · Impact sensor: post-collision safety system

Seatbelts

Front seatbelts: 3-point · Seatbelt force limiters: front and rear · Seatbelt pretensioners: front · Second row seatbelts: 3-point

Seats

Driver seat power adjustments: height · Front seat type: sport bucket · Passenger seat power adjustments: height · Rear seat folding: split · Upholstery: leather

Steering

Steering ratio: 16.6 · Turns lock-to-lock: 2.6

Suspension

Driver Adjustable Suspension: ride control · Front Arm Type: lower control arms · Front Shock Type: gas shock absorbers · Front Spring Type: coil springs · Front Suspension Classification: independent · Front Suspension Type: MacPherson struts · Rear Shock Type: gas shock absorbers · Rear Spring Type: coil springs · Rear Suspension Classification: independent · Rear Suspension Type: multi-link · Stabilizer bar(s): rear · Suspension control: electronic

Telematics

Phone: hands free · Phone wireless data link: Bluetooth

Tires

Type: performance

Tires and Rims

Wheel type: aluminum alloy

Windows

Front wipers: rain sensing · Rear wiper: intermittent

Air Conditioning

Active charcoal air filtration · Automatic climate control front air conditioning · Dual front air conditioning zones

Airbags

Dual front airbags · Passenger airbag deactivation: occupant sensing deactivation · Front side airbags · Front side curtain airbags

Audio System

Antenna Type: diversity · Bluetooth auxiliary audio input · Single disc in-Dash CD · MP3 player: CD MP3 Playback · AM/FM radio · Total Number of Speakers: 9 · 235 watts

Brakes

ABS: 4-wheel · Front brake diameter: 13.4 · Front brake width: 1.34 · Front brakes: ventilated disc · Rear brake diameter: 13.0 · Rear brake width: 1.1 · Rear brakes: ventilated disc

Comfort Features

Center console trim: leather · Dash trim: leather · Door trim: leather · Floor Mat Material: carpet · Floor Material: carpet · Floor Mats: front · Foot pedal trim: stainless steel · Shift knob trim: leather · Steering wheel trim: leather

Convenience Features

Assist handle: front · Center console: front console with storage · Cupholders: front · Dimming rearview mirror: auto-dimming · Multi-function remote: trunk release · One-touch windows: 2 · Power outlet(s): 12V front · Power steering: speed-proportional · Power windows: lockout button · Reading lights: front · Steering wheel: tilt and telescopic · Steering wheel mounted controls: cruise controls · Storage: door pockets · Vanity mirrors: dual illuminating

Driver Seat

Manual adjustments: 2 · Power adjustments: 4

Exterior Features

Door handle color: body-color · Exhaust: dual exhaust tips · Exhaust tip color: stainless-steel · Front bumper color: body-color · Grille color: black · Mirror color: body-color · Rear bumper color: body-color · Rear spoiler: electronically controlled · Rear spoiler color: body-color · Window trim: black

Headrests

Front headrests: adjustable · Number of front headrests: 2

In Car Entertainment

Infotainment screen size: 7 in.

Instrumentation

Fuel economy display: MPG · Instrument cluster screen size: 4.6 in. · Warnings and reminders: low fuel level

Lights

Daytime running lights: LED · Headlights: auto delay off · Tail and brake lights: LED

Mirrors

Exterior mirrors: heated

Passenger Seat

Manual Adjustments: 2 · Power adjustments: 4

Rear Seats

Type: bucket

Roof

Convertible rear window: glass · Convertible roof: remote operation

Safety

Active head restraints: driver · Crumple zones: rear · Impact sensor: post-collision safety system

Seatbelts

Front seatbelts: 3-point · Seatbelt force limiters: front and rear · Seatbelt pretensioners: front · Second row seatbelts: 3-point

Seats

Driver seat power adjustments: reclining · Front seat type: sport bucket · Passenger seat power adjustments: reclining · Rear seat folding: split · Upholstery: leather

Steering

Steering ratio: 16.6 · Turns lock-to-lock: 2.6

Suspension

Driver Adjustable Suspension: ride control · Front Arm Type: lower control arms · Front Shock Type: gas shock absorbers · Front Spring Type: coil springs · Front Suspension Classification: independent · Front Suspension Type: MacPherson struts · Rear Shock Type: gas shock absorbers · Rear Spring Type: coil springs · Rear Suspension Classification: independent · Rear Suspension Type: multi-link · Stabilizer bar(s): rear · Suspension control: electronic

Telematics

Phone: hands free · Phone wireless data link: Bluetooth

Tires

Type: performance

Tires and Rims

Wheel type: aluminum alloy

Windows

Front wipers: rain sensing · Rear wiper: intermittent

Air Conditioning

Active charcoal air filtration · Automatic climate control front air conditioning · Dual front air conditioning zones

Airbags

Dual front airbags · Passenger airbag deactivation: occupant sensing deactivation · Front side airbags · Front side curtain airbags

Audio System

Antenna Type: diversity · Bluetooth auxiliary audio input · Single disc in-Dash CD · MP3 player: CD MP3 Playback · HD radio · Total Number of Speakers: 9 · 235 watts

Brakes

ABS: 4-wheel · Front brake diameter: 13.4 · Front brake width: 1.34 · Front brakes: ventilated disc · Rear brake diameter: 13.0 · Rear brake width: 1.1 · Rear brakes: ventilated disc

Comfort Features

Center console trim: leather · Dash trim: leather · Door trim: leather · Floor Mat Material: carpet · Floor Material: carpet · Floor Mats: front · Foot pedal trim: stainless steel · Shift knob trim: leather · Steering wheel trim: leather

Convenience Features

Assist handle: front · Center console: front console with storage · Cupholders: front · Dimming rearview mirror: auto-dimming · Multi-function remote: trunk release · One-touch windows: 2 · Power outlet(s): 12V front · Power steering: speed-proportional · Power windows: lockout button · Reading lights: front · Steering wheel: tilt and telescopic · Steering wheel mounted controls: audio · Storage: door pockets · Vanity mirrors: dual illuminating

Driver Seat

Manual adjustments: 2 · Power adjustments: 4

Drivetrain

4WD Type: full time · Limited slip differential: center

Exterior Features

Door handle color: body-color · Exhaust: dual exhaust tips · Exhaust tip color: stainless-steel · Front bumper color: body-color · Grille color: black · Mirror color: body-color · Rear bumper color: body-color · Rear spoiler: electronically controlled · Rear spoiler color: body-color · Window trim: black

Headrests

Front headrests: adjustable · Number of front headrests: 2

In Car Entertainment

Infotainment screen size: 7 in.

Instrumentation

Fuel economy display: MPG · Instrument cluster screen size: 4.6 in. · Warnings and reminders: low oil pressure

Lights

Daytime running lights: LED · Headlights: self-leveling · Tail and brake lights: LED

Mirrors

Exterior mirrors: heated

Passenger Seat

Manual Adjustments: 2 · Power adjustments: 4

Rear Seats

Type: bucket

Roof

Convertible rear window: glass · Convertible roof: remote operation

Safety

Active head restraints: driver · Crumple zones: front · Impact sensor: post-collision safety system

Seatbelts

Front seatbelts: 3-point · Seatbelt force limiters: front · Seatbelt pretensioners: front and rear · Second row seatbelts: 3-point

Seats

Driver seat power adjustments: reclining · Front seat type: sport bucket · Passenger seat power adjustments: reclining · Rear seat folding: split · Upholstery: leather

Steering

Steering ratio: 16.6 · Turns lock-to-lock: 2.6

Suspension

Driver Adjustable Suspension: ride control · Front Arm Type: lower control arms · Front Shock Type: gas shock absorbers · Front Spring Type: coil springs · Front Suspension Classification: independent · Front Suspension Type: MacPherson struts · Rear Shock Type: gas shock absorbers · Rear Spring Type: coil springs · Rear Suspension Classification: independent · Rear Suspension Type: multi-link · Stabilizer bar(s): front · Suspension control: electronic

Telematics

Phone: hands free · Phone wireless data link: Bluetooth

Tires

Type: performance

Tires and Rims

Wheel type: aluminum alloy

Windows

Front wipers: variable intermittent · Rear wiper: intermittent

Air Conditioning

Active charcoal air filtration · Automatic climate control front air conditioning · Dual front air conditioning zones

Airbags

Dual front airbags · Passenger airbag deactivation: occupant sensing deactivation · Front side airbags · Front side curtain airbags

Audio System

Antenna Type: diversity · Bluetooth auxiliary audio input · Single disc in-Dash CD · MP3 player: CD MP3 Playback · Premium Brand: Bose · HD radio · Satellite Radio: SiriusXM · 1 subwoofer · Surround audio: 5.1 · Total Number of Speakers: 13 · 385 watts

Brakes

ABS: 4-wheel · Front brake diameter: 15.0 · Front brake width: 1.3 · Front brakes: ventilated disc · Rear brake diameter: 13.8 · Rear brake width: 1.1 · Rear brakes: ventilated disc

Comfort Features

Center console trim: leather · Dash trim: leather · Door trim: leather · Floor Mat Material: carpet · Floor Material: carpet · Floor Mats: front · Foot pedal trim: stainless steel · Shift knob trim: leather · Steering wheel trim: leather

Convenience Features

Assist handle: front · Center console: front console with storage · Cupholders: front · Dimming rearview mirror: auto-dimming · Memorized settings: driver seat · Multi-function remote: keyless entry · One-touch windows: 2 · Power outlet(s): 12V front · Power steering: speed-proportional · Power windows: lockout button · Reading lights: front · Steering wheel: tilt and telescopic · Steering wheel mounted controls: audio · Storage: door pockets · Vanity mirrors: dual illuminating

Driver Seat

Adjustable lumbar support: power · Power adjustments: 6

Drivetrain

4WD Type: full time · Limited slip differential: center

Exterior Features

Door handle color: body-color · Exhaust: dual exhaust tips · Exhaust tip color: stainless-steel · Front bumper color: body-color · Grille color: black · Mirror color: body-color · Rear bumper color: body-color · Rear spoiler: electronically controlled · Rear spoiler color: body-color · Window trim: black

Headrests

Front headrests: adjustable · Number of front headrests: 2

In Car Entertainment

Infotainment screen size: 7 in.

Instrumentation

Fuel economy display: range · Instrument cluster screen size: 4.6 in. · Warnings and reminders: coolant temperature warning

Lights

Daytime running lights: LED · Headlights: self-leveling · Tail and brake lights: LED

Mirrors

Exterior mirrors: heated

Passenger Seat

Adjustable lumbar support: power · Power adjustments: 6

Rear Seats

Type: bucket

Roof

Moonroof: power glass

Safety

Active head restraints: driver · Crumple zones: front · Impact sensor: post-collision safety system · Parking sensors: rear

Seatbelts

Front seatbelts: 3-point · Seatbelt force limiters: front · Seatbelt pretensioners: front · Second row seatbelts: 3-point

Seats

Driver seat power adjustments: reclining · Front seat type: bucket · Passenger seat power adjustments: reclining · Rear seat folding: one-piece · Upholstery: leather

Suspension

Driver Adjustable Suspension: ride control · Front Arm Type: lower control arms · Front Shock Type: gas shock absorbers · Front Spring Type: coil springs · Front Suspension Classification: independent · Front Suspension Type: MacPherson struts · Rear Shock Type: gas shock absorbers · Rear Spring Type: coil springs · Rear Suspension Classification: independent · Rear Suspension Type: multi-link · Stabilizer bar(s): front · Suspension control: electronic

Telematics

Navigation system: hard drive navigation system · Phone: hands free · Phone wireless data link: Bluetooth

Tires

Type: performance

Tires and Rims

Wheel type: aluminum alloy

Windows

Front wipers: variable intermittent · Rear wiper: intermittent

Air Conditioning

Active charcoal air filtration · Automatic climate control front air conditioning · Dual front air conditioning zones

Airbags

Dual front airbags · Passenger airbag deactivation: occupant sensing deactivation · Front side airbags · Front side curtain airbags

Audio System

Antenna Type: diversity · Bluetooth auxiliary audio input · Single disc in-Dash CD · MP3 player: CD MP3 Playback · Premium Brand: Bose · AM/FM radio · Satellite Radio: SiriusXM · 1 subwoofer · Surround audio: 5.1 · Total Number of Speakers: 12 · 385 watts

Brakes

ABS: 4-wheel · Front brake diameter: 15.0 · Front brake width: 1.3 · Front brakes: ventilated disc · Rear brake diameter: 13.8 · Rear brake width: 1.1 · Rear brakes: ventilated disc

Comfort Features

Center console trim: leather · Dash trim: leather · Door trim: leather · Floor Mat Material: carpet · Floor Material: carpet · Floor Mats: front · Foot pedal trim: stainless steel · Shift knob trim: leather · Steering wheel trim: leather

Convenience Features

Assist handle: front · Center console: front console with storage · Cupholders: front · Dimming rearview mirror: auto-dimming · Memorized settings: side mirrors · Multi-function remote: keyless entry · One-touch windows: 2 · Power outlet(s): 12V front · Power steering: speed-proportional · Power windows: lockout button · Reading lights: front · Steering wheel: tilt and telescopic · Steering wheel mounted controls: cruise controls · Storage: door pockets · Vanity mirrors: dual illuminating

Driver Seat

Adjustable lumbar support: power · Power adjustments: 6

Drivetrain

4WD Type: full time · Limited slip differential: center

Exterior Features

Door handle color: body-color · Exhaust: dual exhaust tips · Exhaust tip color: stainless-steel · Front bumper color: body-color · Grille color: black · Mirror color: body-color · Rear bumper color: body-color · Rear spoiler: electronically controlled · Rear spoiler color: body-color · Window trim: black

Headrests

Front headrests: adjustable · Number of front headrests: 2

In Car Entertainment

Infotainment screen size: 7 in.

Instrumentation

Fuel economy display: MPG · Instrument cluster screen size: 4.6 in. · Warnings and reminders: coolant temperature warning

Lights

Daytime running lights: LED · Headlights: HID · Tail and brake lights: LED

Mirrors

Exterior mirrors: power

Passenger Seat

Adjustable lumbar support: power · Power adjustments: 6

Rear Seats

Type: bucket

Roof

Convertible rear window: glass · Convertible roof: power

Safety

Active head restraints: driver · Crumple zones: front · Impact sensor: post-collision safety system · Parking sensors: front

Seatbelts

Front seatbelts: 3-point · Seatbelt force limiters: front · Seatbelt pretensioners: front and rear · Second row seatbelts: 3-point

Seats

Driver seat power adjustments: reclining · Front seat type: bucket · Passenger seat power adjustments: reclining · Rear seat folding: one-piece · Upholstery: leather

Suspension

Driver Adjustable Suspension: ride control · Front Arm Type: lower control arms · Front Shock Type: gas shock absorbers · Front Spring Type: coil springs · Front Suspension Classification: independent · Front Suspension Type: MacPherson struts · Rear Shock Type: gas shock absorbers · Rear Spring Type: coil springs · Rear Suspension Classification: independent · Rear Suspension Type: multi-link · Stabilizer bar(s): front · Suspension control: electronic

Telematics

Navigation system: hard drive navigation system · Phone: hands free · Phone wireless data link: Bluetooth

Tires

Type: performance

Tires and Rims

Wheel type: aluminum alloy

Windows

Front wipers: rain sensing · Rear wiper: intermittent

Air Conditioning

Active charcoal air filtration · Automatic climate control front air conditioning · Dual front air conditioning zones

Airbags

Dual front airbags · Passenger airbag deactivation: occupant sensing deactivation · Front side airbags · Front side curtain airbags

Audio System

Antenna Type: diversity · Bluetooth auxiliary audio input · Single disc in-Dash CD · MP3 player: CD MP3 Playback · Premium Brand: Bose · AM/FM radio · Satellite Radio: SiriusXM · 1 subwoofer · Surround audio: 5.1 · Total Number of Speakers: 13 · 385 watts

Brakes

ABS: 4-wheel · Front brake diameter: 15.0 · Front brake width: 1.3 · Front brakes: ventilated disc · Rear brake diameter: 13.8 · Rear brake width: 1.1 · Rear brakes: ventilated disc

Comfort Features

Center console trim: leather · Dash trim: leather · Door trim: leather · Floor Mat Material: carpet · Floor Material: carpet · Floor Mats: front · Foot pedal trim: stainless steel · Shift knob trim: leather · Steering wheel trim: leather

Convenience Features

Assist handle: front · Center console: front console with storage · Cupholders: front · Dimming rearview mirror: auto-dimming · Memorized settings: driver seat · Multi-function remote: keyless entry · One-touch windows: 2 · Power outlet(s): 12V front · Power steering: speed-proportional · Power windows: lockout button · Reading lights: front · Steering wheel: tilt and telescopic · Steering wheel mounted controls: audio · Storage: door pockets · Vanity mirrors: dual illuminating

Driver Seat

Adjustable lumbar support: power · Power adjustments: 6

Drivetrain

4WD Type: full time · Limited slip differential: center

Exterior Features

Door handle color: body-color · Exhaust: dual exhaust tips · Exhaust tip color: stainless-steel · Front bumper color: body-color · Grille color: black · Mirror color: body-color · Rear bumper color: body-color · Rear spoiler: electronically controlled · Rear spoiler color: body-color · Window trim: black

Headrests

Front headrests: adjustable · Number of front headrests: 2

In Car Entertainment

Infotainment screen size: 7 in.

Instrumentation

Fuel economy display: range · Instrument cluster screen size: 4.6 in. · Warnings and reminders: low fuel level

Lights

Daytime running lights: LED · Headlights: auto delay off · Tail and brake lights: LED

Mirrors

Exterior mirrors: heated

Passenger Seat

Adjustable lumbar support: power · Power adjustments: 6

Rear Seats

Type: bucket

Roof

Moonroof: one-touch open/close

Safety

Active head restraints: driver · Crumple zones: front · Impact sensor: post-collision safety system · Parking sensors: rear

Seatbelts

Front seatbelts: 3-point · Seatbelt force limiters: front · Seatbelt pretensioners: front and rear · Second row seatbelts: 3-point

Seats

Driver seat power adjustments: height · Front seat type: bucket · Passenger seat power adjustments: height · Rear seat folding: one-piece · Upholstery: leather

Suspension

Driver Adjustable Suspension: ride control · Front Arm Type: lower control arms · Front Shock Type: gas shock absorbers · Front Spring Type: coil springs · Front Suspension Classification: independent · Front Suspension Type: MacPherson struts · Rear Shock Type: gas shock absorbers · Rear Spring Type: coil springs · Rear Suspension Classification: independent · Rear Suspension Type: multi-link · Stabilizer bar(s): rear · Suspension control: electronic

Telematics

Navigation system: hard drive navigation system · Phone: hands free · Phone wireless data link: Bluetooth

Tires

Type: performance

Tires and Rims

Wheel type: aluminum alloy

Windows

Front wipers: rain sensing · Rear wiper: intermittent

Air Conditioning

Active charcoal air filtration · Automatic climate control front air conditioning · Dual front air conditioning zones

Airbags

Dual front airbags · Passenger airbag deactivation: occupant sensing deactivation · Front side airbags · Front side curtain airbags

Audio System

Antenna Type: diversity · Bluetooth auxiliary audio input · Single disc in-Dash CD · MP3 player: CD MP3 Playback · Premium Brand: Bose · HD radio · Satellite Radio: SiriusXM · 1 subwoofer · Surround audio: 5.1 · Total Number of Speakers: 12 · 385 watts

Brakes

ABS: 4-wheel · Front brake diameter: 15.0 · Front brake width: 1.3 · Front brakes: ventilated disc · Rear brake diameter: 13.8 · Rear brake width: 1.1 · Rear brakes: ventilated disc

Comfort Features

Center console trim: leather · Dash trim: leather · Door trim: leather · Floor Mat Material: carpet · Floor Material: carpet · Floor Mats: front · Foot pedal trim: stainless steel · Shift knob trim: leather · Steering wheel trim: leather

Convenience Features

Assist handle: front · Center console: front console with storage · Cupholders: front · Dimming rearview mirror: auto-dimming · Memorized settings: side mirrors · Multi-function remote: trunk release · One-touch windows: 2 · Power outlet(s): 12V front · Power steering: speed-proportional · Power windows: lockout button · Reading lights: front · Steering wheel: tilt and telescopic · Steering wheel mounted controls: cruise controls · Storage: door pockets · Vanity mirrors: dual illuminating

Driver Seat

Adjustable lumbar support: power · Power adjustments: 6

Drivetrain

4WD Type: full time · Limited slip differential: center

Exterior Features

Door handle color: body-color · Exhaust: dual exhaust tips · Exhaust tip color: stainless-steel · Front bumper color: body-color · Grille color: black · Mirror color: body-color · Rear bumper color: body-color · Rear spoiler: electronically controlled · Rear spoiler color: body-color · Window trim: black

Headrests

Front headrests: adjustable · Number of front headrests: 2

In Car Entertainment

Infotainment screen size: 7 in.

Instrumentation

Fuel economy display: range · Instrument cluster screen size: 4.6 in. · Warnings and reminders: coolant temperature warning

Lights

Daytime running lights: LED · Headlights: HID · Tail and brake lights: LED

Mirrors

Exterior mirrors: heated

Passenger Seat

Adjustable lumbar support: power · Power adjustments: 6

Rear Seats

Type: bucket

Roof

Convertible rear window: glass · Convertible roof: power

Safety

Active head restraints: driver · Crumple zones: rear · Impact sensor: post-collision safety system · Parking sensors: front

Seatbelts

Front seatbelts: 3-point · Seatbelt force limiters: front and rear · Seatbelt pretensioners: front · Second row seatbelts: 3-point

Seats

Driver seat power adjustments: height · Front seat type: bucket · Passenger seat power adjustments: height · Rear seat folding: one-piece · Upholstery: leather

Suspension

Driver Adjustable Suspension: ride control · Front Arm Type: lower control arms · Front Shock Type: gas shock absorbers · Front Spring Type: coil springs · Front Suspension Classification: independent · Front Suspension Type: MacPherson struts · Rear Shock Type: gas shock absorbers · Rear Spring Type: coil springs · Rear Suspension Classification: independent · Rear Suspension Type: multi-link · Stabilizer bar(s): rear · Suspension control: electronic

Telematics

Navigation system: hard drive navigation system · Phone: hands free · Phone wireless data link: Bluetooth

Tires

Type: performance

Tires and Rims

Wheel type: aluminum alloy

Windows

Front wipers: variable intermittent · Rear wiper: intermittent