1.Rated 120/150 PSI. 2.This pressure switch is designed for high-pressure on-board air systems. 3.Perfect for air horns that require high air pressure. 4.Preset to turn on the compressor when tank pressure is below 120 psi, and turn off the compressor. when the air tank pressure reached 150 psi,with a tolerance of & plusmn;10%. 5.Can operate reliably up to 3.5 amps. For 12 volt power source. With 1/8inch male pipe thread,and 1/4inch push-on electric terminals. Specification: Volt: 12V Electric current: 3.5A Fitment: Fits for Air Horns,Train Horns,Air Suspension Compressors,etc. Colour: black Material: metal Package Contents: 1 x Horn compressor pressure switch Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.