A high pressure air hose. Just plug in into your cigarette lighter and plug into your tyre. It features and 12 volt plug, valve/tyre chuck, compressor power switch, pressure gauge, mattress adaptor and a ball adaptor, so you can use it for blowing up balls, mattresses, lilos etc., as well as tyres. Never be caught out by a slow puncture again. Boxed with full instructions for use.