Introduction of the key: Right Select Key: Select key of menu M Menu Key: Long pre into menu setting Left Select Key: Long pre to turn on/off, Select key of menu Features: Type: Intelligent Solar TPMS Car Tire Preure Solar power charging, dont need to charge by connecting car cigarette lighter Colorful LCD Digital displaying, clear to show tire information Rear-time monitoring preure & temperature of 4 tires Low air preure/high temperature alarm High Temperature / Leakage / Low Battery Alarm Intelligent Shock Boot when car moving, dont need to turn on/off Wirele connect by sensors, easy install Two units (PSI / Bar) changeable, you can set the one you like. External Sensor: Easy to install, convenient to replace Battery: built-in CR1632 button cell Working voltage: 2.0 - 3.6V Working environment: -30 ~105 Deg.C Preure accuracy: plus or minus 0.1bar Waterproof grade: IP67 Transmiion frequency: 433.92MHz Monitor: Battery type: 280mAh Li-ion battery Working voltage: 2.6-3.6V Working environment: -20 ~70 Deg.C Transmiion frequency: 433.92MHz Preure unit: psi / bar Temperature unit: Deg.C / Deg.F Package Included: 1 set Car Tyre Preure Monitoring System About Portable Tire Tester: Features: 100% Brand new and high quality LCD screen display with backlit for easy reading Small portable design, easy to hold and operate Preure units available: PSI, BAR, KPA, KGF/CM2 Accurate and quick measuring, reliable to use Manual power on/off and auto power off for power saving LED light at gauge nozzle, convenient to use even at night This Mini Tire Preure Gauge with easy-to-read LCD screen, is used to monitor your tyre preure, thereby extending tire life, increasing fuel efficiency and ensuring your safety.It is suitable for measuring tire air preure of cars, motorcycles,etc. Specifications: Test range: 0-150PSI Accuracy: 1PSI Resolution: 0.5PSI Units: PSI, BAR, KPA, KGF/CM2 Power supply: 1*3V CR2032 button battery (Included) Product size: As the picture Material: ABS Package included: 1* Tyre preure guage