Gentex K21 Auto-Dimming Rear View Mirror w/Compass and Temp

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Gentex Auto Dimming Mirro w/Compass and Temperature
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Features

  • The Gentex K21 Auto-Dimming Rear View Mirror reduces eyestrain and driver fatigue
  • High-tech sensors and advanced circuitry recognizes and eliminates dangerous rear-approaching light
  • The K21 Auto-Dimming Rear View Mirror is equipped with a self-calibrating digital compass
  • Integrated remote exterior thermometer digitally reports outside temps and ice warnings
  • The K21 Auto-Dimming Rear View Mirror comes complete with detailed installation instructions and all mounting hardware
  • Installation of the mirror's electronic components requires some hard wiring (see Installation Guide tab for details)
  • Available with the optional Gentex Wire Cover for the most professional-looking installation that conceals loose wires (not necessary for all vehicles—see note below)
  • Your Gentex K21 Auto-dimming Rear View Mirror is backed by a 3-year / 36,000 mile warranty

Description

Headlight glare and your rear view mirror make a dangerous combination. Eliminate this volatile mixture with the Gentex K21 Auto-Dimming Rear View Mirror.

The K21 Auto-Dimming Rear View Mirror detects dangerous rear-approaching light and eliminates it with "intelligent" circuitry. What's more, less glare means less eyestrain and driver fatigue.

As if that weren't enough, the K21 Auto-Dimming Rear View Mirror comes with a self-calibrating digital display compass. The mirror even has an exterior thermometer that displays temps and ice warnings.

The windshield-mounted mirror comes complete with detailed installation instructions and all necessary hardware - perfect for the experienced do-it-yourselfer or professional installer with some wiring required. And, the Auto-Dimming Rear View Mirror comes with 3-year / 36, 000 mile warranty. See what a difference the K21 Auto-Dimming Rear View Mirror can make.

Notes

  • Installation of the mirror's electronic components requires some hard wiring (see Installation Guide tab for details)
  • The Gentex Wire Cover is highly recommended if there is 3" or more space between your mirror and the headliner. It conceals otherwise loose and visible wires running to the mirror. Select this part under "optional accessories" above.

Average Customer Rating

  (161)
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Awesome

Posted on 02/15/2007 by Jason L. - 2005 Dodge Dakota (Suffolk,VA)

"Next to a tonneau cover, this was the best thing I've put in my truck. The auto-dimming feature is great. My wife has this same mirror from the factory in her Envoy and that got me hooked on this. Temp reading is right on the money."

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About Jason L.
Vehicle
2005 Dodge Dakota
 
A MUST HAVE

Posted on 02/02/2007 by Alexandra A M. - 2005 Chrysler Pacifica (Bloomfield Hills,MI)

"The K21 mirror is a driver's best friend; it does every hing it says it does perfectly, AND it give you piece of mind! We had to have it installed due to our lack of "mechanica," but now that we have one, we'l get another. Great Purchase. Great service, too."

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About Alexandra A M.
Vehicle
2005 Chrysler Pacifica
I use my vehicle for
travel, family activities, communting. . .
 
gentex k21

Posted on 02/01/2007 by Thomas E. - 2007 Honda Ridgeline (West Fargo,ND)

"Fantastic value,works great!! Easy install!"

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About Thomas E.
Vehicle
2007 Honda Ridgeline
I use my vehicle for
pleasure
 
K21 in a 2007 Mustang GT

Posted on 02/01/2007 by Matthew B. - 2007 Ford Mustang (Chicago,IL)

"Pros: Looks great, accurate readings, makes you think how you lived without an autodimming mirror. Cons: Accessory wire cover not long enough for my Mustang, mirror is a little loose on its ball joint. I recommend the mirror with a few reservations but it does what it's supposed to pretty well."

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About Matthew B.
Vehicle
2007 Ford Mustang
I use my vehicle for
commuting and road trips.
 
gentex auto-dimming mirror

Posted on 01/25/2007 by Steve F. (Glen Easton,WV)

"I AM VERY HAPPY WITH THE PERFORMANCE OF THE MIRROR, COMPAS AND TEMP WORK GREAT. MY WIFE LOVES IT. SHIPPING WAS REALLY FAST. INSTRUCTIONS WERE COMPLETE. I WOULD HIGHLY RECCOMMEND TO ANYONE."

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About Steve F.
 
Gift - Receiver of gift loves!

Posted on 01/11/2007 by Stacy S. - 2000 Chevy Silverado (Anchorage,AK)

1 of 1 people found the following review helpful.

"I bought this for my Dad, he just installed it recently. He said it was super easy to install and everything works on it perfect. A lot of the other compass mirrors you have to recalibrate every time you restart the vehicle, but this one stays calibrated wonderfully! Auto Dimming works great, and the temperture shows in C and F, which a lot of the other aftermarket products did not do. I would recommend this product 100%"

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About Stacy S.
Vehicle
2000 Chevy Silverado
I use my vehicle for
Work and Play
 
Highly recommend

Posted on 01/11/2007 by Jack R. - 2006 Toyota Highlander (Spring,TX)

1 of 1 people found the following review helpful.

"Because this vehicle was so new I took it to the dealer to have installed. Only took them a couple of hours and a total charge of $120. Not a bad price, seems to be very accurate. I waited a long time for this and not disappointed. Got it for Christmas."

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About Jack R.
Vehicle
2006 Toyota Highlander
I use my vehicle for
Commuting
 
Great mirror, easy install!

Posted on 01/03/2007 by Richard G. - 1999 Chrysler Cirrus (Geneva,IL)

"The mirror dims as advertised and the temp and compass display works perfectly. The installation was the easiest add-on I've ever put into a car! Great wiring harness, great instructions!"

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About Richard G.
Vehicle
1999 Chrysler Cirrus
I use my vehicle for
Commuting
 
Missed Compass & Temp.

Posted on 01/03/2007 by Donald S. - 2004 GMC Envoy (Belle Plaine,KS)

"My last two GM vehicles both had the this same mirror. I didn't realize this Envoy did not have it until I had already bought it. Installation was pretty simple for an average car nut. Less than 2 hrs while watching the Speed channel. Works great!"

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About Donald S.
Vehicle
2004 GMC Envoy
I use my vehicle for
commuting, family activities, boating
 
@005 Toyota Tocoma

Posted on 12/28/2006 by Louis L. - 2005 Toyota Tacoma (Pittstown,NJ)

"Snap to install. Better that the one offered by Toyota. Installed in about 2 hours with little problems. I would recommend this as a great option for the DIY person."

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About Louis L.
Vehicle
2005 Toyota Tacoma
I use my vehicle for
Commuting
 
My mirror is great

Posted on 12/28/2006 by Roderick M. - 2003 Toyota Tundra (Sierraville,CA)

"I have been looking for a mirror like this for a long time. So far I am very happy with the performance. The installation took some time but it was pretty easy. I should be making a commition on the mirrors because I have recomended it to several people already. Rod M"

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About Roderick M.
Vehicle
2003 Toyota Tundra
I use my vehicle for
everything
 
Works like a Charm?

Posted on 12/27/2006 by Peter W. - 2009 Chevy Silverado (Millinocket ,ME )

"This works great here in Northern Maine.Allows me to be aware of Black Ice on Road blinking when the temp goes below freezing,showing Ice on Mirror Window.This is second Mirror I bought."

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About Peter W.
Vehicle
2009 Chevy Silverado
I use my vehicle for
All activities
 
2007 Ford Focus/Gentex K21

Posted on 12/06/2006 by Hugh C. (Bradenton,FL)

"The unit was promptly received. The instructions were good and installation proceeded without much difficulty. The unit functions well and was half the price of a dealer installed unit."

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About Hugh C.
 
providing information

Posted on 11/16/2006 by Janet M. - 2004 Toyota Tacoma (Roseburg,OR)

"This is a Christmas gift for my husband, so I cannot give a rate at this time, however, I also have one and enjoy it."

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About Janet M.
Vehicle
2004 Toyota Tacoma
I use my vehicle for
Pleasure
 
Excellent value

Posted on 11/13/2006 by Ronald J. H. - 2001 Jeep Cherokee (Zionsville,IN)

"The Gentex K21 rear view mirror surpassed all my expectations. Since I could not install it myself, I had it done by an auto accessory store for under $70.00! Also, your 3 year 36,000 mile warranty clinched the deal. Many thanks"

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About Ronald J. H.
Vehicle
2001 Jeep Cherokee
I use my vehicle for
everyday use
 
Great addition to my 2005 Nissan Frontier

Posted on 11/12/2006 by Kevin R. - 2005 Nissan Frontier (Glastonbury,CT)

"The Frontier comes with this mirror as an option which I didn't get. I added this mirror after getting used to driving my wife's car with temp/compass. Installation was pretty straightforward and the directions were easy to follow. The longest part of the job was taking apart and putting together the interior panels. The only hiccup I seem to have is the location of the temp sensor. Installed were they suggested, it would rise about 10 deg while driving. Still looking for the ideal spot. The autodim works great. I don't know how to live without it anymore. Compass is self calibrating and works well too. I recommend this mirror for every car."

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About Kevin R.
Vehicle
2005 Nissan Frontier
I use my vehicle for
commuting, off roading
 
Nice product

Posted on 11/09/2006 by Mike M. - 2004 Ford Excursion (Denison,IA)

"This mirror was extremely easy to install. I was nervous after ready some others comments, but it only took about 30 minutes. It looks great in my Excursion and is working perfectly. Shipping was super fast. Highly recommend this product."

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About Mike M.
Vehicle
2004 Ford Excursion
I use my vehicle for
Fire Department Command Vehicle
 
Gentex K21 review

Posted on 11/03/2006 by Daniel O. L. - 2000 Subaru Outback (Olympia,WA)

"K21 features auto dim/compass/temp.. work great..no more blinding glare in my eyes.. smart buy."

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About Daniel O. L.
Vehicle
2000 Subaru Outback
I use my vehicle for
trips, fishing, skiing
 
Best Mirror i every had

Posted on 09/24/2006 by John H R. - 2006 Mercury Mariner (St Petersburg,FL)

"Iam very Extremely satisfied. Very easy to read dimming feature works great. Installation was a snap. Thank You John H Rapp"

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About John H R.
Vehicle
2006 Mercury Mariner
I use my vehicle for
Fishing ,Travel ,Family activites
 
Nice addition

Posted on 09/19/2006 by Martin P. - 2006 Toyota Highlander (Gresham,OR)

1 of 1 people found the following review helpful.

"It was everything as promised,had trouble finding someone to install it at first. Found an accessory dealer that was willing and able to complet the task for 130.00$. Would like more information on where to place the temperature sensor?"

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About Martin P.
Vehicle
2006 Toyota Highlander
 
Gentex k21 mirror review

Posted on 09/09/2006 by Cindy L K. - 2006 Jeep Liberty (Baytown,TX)

"I received the Gentex K21 Auto Dimming RearView Mirror w/Compass and Temp very quickly and in perfect condition. It was pretty easy to install, the instructions were very clear and helpful. Once the mirror was in, it calibrated just as expected and I love it. The auto-dimming is great as well - I don't think I've ever had one that works quite this well. I'd recommend this to anyone (make sure you order the cable cover too!)."

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About Cindy L K.
Vehicle
2006 Jeep Liberty
I use my vehicle for
Commuting and personal.
 
Glad I bought it

Posted on 09/07/2006 by Randy M. - 2006 Nissan Frontier (Riverside,CA)

"What else can I say. I will buy one for every vehicle I purchase from now on if its not original equipment."

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About Randy M.
Vehicle
2006 Nissan Frontier
I use my vehicle for
personal.
 
Definitely Recommend!

Posted on 08/29/2006 by Brandi S. - 2006 Chevy Equinox (Sparkill,NY)

"This mirror is great!! Gives the interior that little extra umph! I did not install it myself, I took it to my local best buy and they installed it very quickly, it looks like it came with the car! I would definitely recommend this to anyone looking for this type of mirror. I love it."

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About Brandi S.
Vehicle
2006 Chevy Equinox
I use my vehicle for
Driving :-)
 
Gentex K21

Posted on 08/15/2006 by Thomas N. - 2006 Toyota Tacoma (Hanover,MA)

"Awesome mirror. Easy to install. I honestly don't know how you could drive at night without one!"

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About Thomas N.
Vehicle
2006 Toyota Tacoma
I use my vehicle for
commuting
 
gentex k21 mirror

Posted on 07/28/2006 by Ryan L. - 2006 Toyota Tacoma (Claremore,OK)

"the mirror works great installation was easy the mirror works great ryan"

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About Ryan L.
Vehicle
2006 Toyota Tacoma
I use my vehicle for
commuting
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