Features: 100% new and high quality. Solar orUSB charging,much convenient and practical. Colorful LCD digital displaying, clear to show tire information. Wirele 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. Pre 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 preure & temperature of 4 tires Low air preure /High tire preure 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: Preure 0-3.5bar Accuracy: 0.1bar Battery Life: 1-2 years Package included: 1 set x Car Tyre Preure Monitoring System NOTES: 1. Due to different display and lighting effects, the actual color of the item may be slightly different from the color shown on the picture. 2. Please allow 1-5mm measuring deviation due to manual measurement. Thank you! 3. If you have any problem with the product received or your package is miing, please contact us in time, we will reply within 24 hours.