MULTI-FUNCTIONS DESIGN - Designed for checking the tire pressure; Connecting the air pump to inflate the tire; Deflating the air if higher tire pressure. Also a tire inflator to inflate tires when connecting an air compressor. A Tire Venting Machine to bleed off overinflated tires via press its air bleeder valve. BATTERY SAVING - Auto on and will auto off after 20 seconds of inactivity to preserve battery life; built-in air bleeder valve to quickly decrease pressure in overinflated tires. LEAKPROOF & VALVE EXTENDER DESIGN - Straight lock on brass air chuck offers great seal on tire valve outside car tire and frees up your hands to operate the tire pump. 1/4 NPT Quick connect Male Fitting are all integrated into one unit. 90 Degree valve extender allows to connect hard to reach tire valve insides car tire. 1. unscrew the tire valve node. 2. Fix the copper gauge head for the valve 3. the device will show the pressure. 4. You need to find an inflatable pump and gas pipe to connect the inflatable mouth and keep the handle of the product inflating through the inflation device, when the pressure is low or vice versa. 5. after the measurement, unscrew the copper head and press the air bleed button to make the light for 0. Display mode:LCD digital display Measurement Units:PSI, KPA, Bar, Kg/cm Inflatable range:0-200 PSI Working temperature:-10 to 50°C Button function:open key (left), unit switch key (right) Working voltage:DC3.1V LCD battery symbol flashes when battery voltage is lower than 2.5V Static current:less than equal 5UA PSI Display Type:Backlight LCD Scope Of Application: Motorcycle & Car & Truck Small & Medium Truck Truck & Bus Power Suplly:2 AAA batteries(Not included batteries) Colour:Black Material:Aluminum Alloy + Rubber + Copper Size:The hose is about