Five Volume control with membrane switch seat heater1. CompositionTwo heating pads, one wire harness, one controller, one five volume control membrane switch.2. Installation(1) First, take off the cover of the seat, then fix the pads on the back and bottom of the seat separately, put the electrode of pads through the middle gap of bottom and back to under the seat evenly.. ready for connect with controller(2) Plug-in the two plugs from controller to the two plugs from pads