Features: 100% new and high quality. Solar or USB charging,much convenient and practical. Colorful LCD digital displaying, clear to show tire information. Wireless connect by external sensors, easy install. Built-in vibration sensor, the car automatically turns on when starting, and automatically turns off when the car stops. Note:The host must be turned on before installing the sensor. Press and hold the left button for 3 seconds. For the first time, it is recommended to charge with USB for 1 hour. Function: Rear-time monitoring pressure & temperature of 4 tires Low air pressure / High tire pressure alarm High temperature / Leakage / Low Battery Alarm Specifications: Display Material: ABS + Metal Working Temperature: -20 -- +70 Working Frequency: 433.92MHZ 20MHZ Voltage: 3.7V Current: Working 15mA, Standby 50uA Sensors Material: ABS + Metal Working Temperature: -20 -- +85 Working Frequency: 433.92MHZ 20MHZ Voltage: 2.0-3.6V Current: Static 1uA, Dynamic 15mA Tire monitoring Range: Pressure 0-3.5bar Accuracy:0.1bar Battery Life: 1-2 years Package included: 1 set xCar Tyre Pressure Monitoring System Do drop