The Gentex K5 Auto-Dimming Rear View Mirror senses dangerous rear-approaching light and automatically eliminates it with its intelligent circuitry saving your vital night driving vision. And less glare means less eyestrain and driver fatigue. Whats more the K5 Auto-Dimming Rear View Mirror comes with a self-calibrating digital display compass. Youll always know which direction youre headed thanks to the eight directional readouts N NW W SW S SE E and NE. 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.Features. OEM replacement auto-dimming rear view mirror system with compass for GM Ford Chrysler and Toyota. Auto-Dimming technology eliminates distracting and disabling glare improves reaction time decrease stopping time and makes driving at night safer and more comfortable. Built-in Path Point compass display developed by Johnson Controls. Dimension - 12 x 6.5 x 4.75 in.