Yes, the Small, the Iso-Wrap and the Ultra Neck and Back heating pads can all be used in the car as long as you are using this specific inverter with these specific specifications: Pure Sine Wave Car Inverter DC12 to AC110V with power 300 watts
The use of a “Modified Sine Wave Car Inverter, will destroy the controller and void the warranty. Please make sure you are using a Pure Sine Wave Car Inverter.
