CIPA's Auto Dimming Rearview Mirror with Compass, Temperature, and Map Lights provides the perfect solution to annoying headlight glare at night. Sensors react to bright lights and dim the mirror glass for comfort and safety. It also offers a disable button for when dimming is unwanted. Additional features include a digital compass, temperature readout, and dual map lights. The compass features a bright LED display, and is self-calibrating. The temperature feature displays outside ambient temperature, and can be programmed to display in F or C. The map light feature provides that extra bit of light just where you need it. First time installations will require routing a power and sensor wire. Vehicles with an existing auto dimming mirror and a 7 pin connector can plug directly in. Otherwise, the wires can be tapped using the wire tap provided. Mirror is 10 in long by 2.5 in tall, and is a wedge base mounting mirror. This kit includes a mirror, 6.5 ft power wire harness, wire tap, 9 wire ties, temperature sensor, 14 ft temperature sensor wire, operation card, wedge button, and instructions. Mirror mounting epoxy not included. Hint: A wedge mount mirror is commonly found on domestic vehicles and is removed by loosening a small screw and pushing the mirror up toward the roof. Made in the USA and FMVSS approved under section 571.111 of Standard No. 111. Note: We do not recommend installing these mirrors if your vehicle has airbag sensors in the headliner, if your vehicle is equipped with OnStar, or if your vehicle is a hybrid model. Installation of this mirror may disable or damage certain components which are critical to the safety features installed on your vehicle. Check with your vehicle manufacturer for more information., Add the convenience of auto dimming to reduce glare from headlight of vehicles approaching from behind; Installation is easy attaches to existing button (new button also included); Dual map lights provide downward illumination that won't interfere with driver's vision; Features a digital compass, temperature readout, and dual map lights; "Ice Warning" flashes when outside temperature drops below freezing