Solar charging, don't need to connect car lighter to charge Color LCD digital display for clear display of tire information Monitor pressure and temperature of 4 tires in real time Low air pressure/high temperature alarm High Temperature / Leakage / Low Battery Alarm Intelligent Shock Boot when car moving, don't need to turn on/off Wireless connect with sensors, easy install,attached to glass Two units (PSI / Bar) changeable, you can set you like. Intelligent On and Off Product Name:Tire pressure monitor Working voltage: 3.7V Working temperature: 70 °C Waterproof grade: IPX7 Pressure range: 0-6BAR Transmission frequency: 433.92MHz Transmission power: 10dBm Charging voltage: DC 5.1V Color: Black Material: Metal + ABS Package Contents: 1PCS x Car TPMS Monitor System 4PCS x External Tire Pressure Sensor Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.