Convenient manual telescoping feature allows mirrors to be easily extended to help increase your range of vision. Also features a power adjust, electrically heats glass to minimize snow and ice buildup, as well as powering turn signal and puddle lamps for increased safety. Once added, the Trailer Tow Mirrors will maintain those features that were originally offered with vehicle. For instance, the heated feature will only work if the mirrors originally on the customers vehicle had that feature. Dealer installation only.