Universal 12V Car Seat Heater Carbon Fiber Heat Pads Set 5 Levels Digital Display Switch Dual Control System With Harness Kit Features: A comfortable necessary for driving in winter. Designed to be installed between the seat cover and cushion. Using a heating pad that can reduce air conditioning open, not only fuel-efficient can also relieve the air conditioning hot, relieve driving fatigue. Made of carbon fiber material, quick heat-up time, not easy to corrode or break. The carbon fiber heating pad can be cut horizontally according to the size of the seat. Two heated pads for one seat: 1pc on back and 1pc on the bottom. With sticker, easy to install. Specification: Material: Carbon Fiber Dimension(Unit): Approx. 48cm x 27cm (18.9'' x 10.6'') Wire Length: 2.3M (90.5'') Color: White Power Rating: DC 12V, 27 3W Thermostat: 35 +10 / -5c Round Switch: 5-level digital display switch dual control system with Harness Fitment: Fits all seats such as car, SUV, truck, RV, boat, universal fit on any 12V DC system on leather. Note: Please verify your seat covers are removable before purchase. Professional installation is highly recommended!!! Please DO NOT use on seats where the covers are fused to the foam. Package Included: 4 * Heater Pads 1 * 5-level digital display switch OR Only 4 * Heater Pads OR Only1 * 5-level digital display switch If your car has not installed a heating pad, then you can order a complete set of products. ****It is suitable for installing 2 seats.**** ****If your car already have a heating pad, then you can just order the switch**** 1 set of switches and wiring harness can be installed with 2 seats If your car already has the right switch and wiring harness, then you can just order the heating pad. ****2 heating pads to install 1 seat**** Car Seat Heater Description Part function description A. Red main line: Connect the battery positive B. Black main line: Connect the battery negative C. Red auxiliary line: Connect ACC key line positive OR Cigarette lighter positive D. Yellow auxiliary line: Connect the light line OR instrument panel line positive E. Switch control box F. Switch: Control 4 heating pads for 2 seats G. Wire Harness: Length 250cm/98 inch H. Fuse I. Thermostat: Temperature stabilization function