The 450H Hard-Mount Automatic comes with a built-in, moisture resistant ON/OFF power switch. The trigger control function eliminates the need to turn the compressor OFF and ON between each tire fill, making multi-tire inflation a breeze and allowing you to check tire pressure during inflation by simply releasing the inflation gun trigger. It features a heavy duty stainless steel leader hose with a 1/4” quick connect stud for hookup to a coil hose and insulated wiring for simple installation.