Interior accessories help drivers navigate, monitor conditions around their vehicles, and keep their vehicles clean and comfortable. 12-volt accessories include power adapters and fans that plug into a vehicle's 12-volt outlet. DC auxiliary heaters warm vehicle interiors using surplus power from a generator linked to the engine. Interior automotive accessories are used for holding drinks, mounting electronics, monitoring time or temperature, and cushioning seats. Covers and floor mats protect vehicle interiors from stains, dirt, and damage.