SNAP, DON"T SNIP™ The Tekonsha® ZCI™: Zero Contact Interface is the only trailer light power module in the industry that has ZERO contact with the vehicle's lighting system. The ZCI™ uses sensors that simply SNAP around he wires with NO DIRECT CONTACT. The Tekonsha® ZCI™ 1. Requires no cutting or splicing of vehicle's wiring eliminating ALL interference and draw on vehicle's system. 2. Works with all known vehicle applications . 3. Is portable and great for leased or rented vehicles. You can take it with you. For more information visit www.tekonsha.com