The direct tire pressure monitoring system equips each tire with a high-sensitivity sensor, which can monitor the pressure and temperature of the tire in real time. After digital-to-analog conversion, the data is transmitted by radio signals to the monitor on the bridge. Pressure and temperature values are displayed visually immediately. Specifications: Receiver Host -polymer battery recharge 400 times,capacity loss 25% -Working Temperature: -20℃~85℃ -Working Frequency: 433.92MHZ -Test The Reception Sensitivity: -91dbm -USB Input Current: DC 5V -Working Current: 14mA (peak) ; 2.5~2.6mA(standby) -Battery Capacity: 400mA -Solar Charging Current:100mah Sensor -Working Temperature: -20℃~125℃ -Working Frequency: 433.92MHZ -Working Humidity: Max 95%  Tire monitoring Range Value: 0~3.5 bar /0~50PSI,  Deviation ±0.013 -Tire Temperature Monitoring Range Value: -40℃ ~ 125℃, Deviation ± 3℃ -Battery lift: 5 Years -Transmit Power: R & D environment test below-17db Color: Black Packing: Carton Package Weight: 221g / 7.8oz Package Size: 18*13.5*4.5cm / 7*5*1.8in   Notes: Due to the light and screen difference, the item's color may be slightly different from the pictures. Please allow 1-3cm differences due to manual measurement. Package List: 1 * Tire Pressure Monitoring System 4 * Sensors 4 * Anti-lost Nuts 1 * Portable Tool 1 * USB Cable 1*  Tape   1 * User Manual(English)