The inflatable hose at the top of the gas nozzle is inserted directly into the tire valve, listen to the sound of air coming out of the tire, as it is said that the air circulation can tighten the gas nozzle to inflate the air can no longer escape. Breathability When the pointer reaches the proper tire pressure, the instrument pointer rises with the tire's degree of saturation. Material: The airpressor comes in a metal boot body. Usage: Can be used for Car, Bike, Cycle. Also used for basketball, football etc.