Tekonsha Zero Contact Interface Universal ModuLite & Installation Kit ZCI. ZCI uses sensors that simply SNAP around the wires NO DIRECT CONTACT. ZCI only detects if current is present in the wire. Therefore there is ZERO chance of feedback to the vehicle. It works with all known vehicle systems including standard 2 or 3 wire systems PWM (pulse width modulation) systems Multiplexing (2 or 3 wire systems) and Low Side Switching. Many vehicles one solution Features/Specifications: NO CUTTING OR SPLICING VEHICLE WIRING Isolates Trailer Light Operation from Tow Vehicle's Electrical System Works with 2 or 3 wire systems Works with PWM or Multiplexed systems requiring 2 or 3 wire hookup Rated for up to 4.2 amps for turn/stop and 7.5 amps for taillight trailer circuits Specifications for Tekonsha ZCI Zero Contact Interface Universal ModuLite & Installation Kit: Manufacturer: Tekonsha Color: Silver Features of Tekonsha ZCI Zero Contact Interface Universal ModuLite & Installation Kit No cutting or splicing vehicle wiring Isolates Trailer Light Operation from Tow Vehicle's Electrical System Works with 2 or 3 wire systems Works with PWM or Multiplexed systems requiring 2 or 3 wire hookup Rated for up to 4.2 amps for turn/stop & 7.5 amps for taillight trailer circuits Works with low side switched vehicles Integrated auto resetting short & overload protection Robust design allows for interior or exterior mounting Package Contents: Tekonsha ZCI Zero Contact Interface Universal ModuLite & Installation Kit Tekonsha 119251: Zero Contact Interface Universal ModuLite & Installation Kit ZCI