U812 Car Tire Pressure Monitor System 4 External Sensor Solar Mini USB Connection ModeDescription:Battery life more than 2 years.LED display and 4 external sensors.Support tire position exchange function.Sensor protection grade: IP5K4K WaterproofWith FREESCALE Chip and RENATA anti-explosion battery.Solar energy to get electricity, with extra mini USB port to be charged.With two pressure unit PSI, BAR and two temperature unit ℃, ℉ for option.Display Specification:Working Temperature: (-20℃ ~ +80℃)Stroage Temperature: (-30℃ ~ +85℃)Input Voltage: DC 8V~16VTransmitting Frequency: 433.92MHzSize: 34*43*84mm (L*W*H)Weight: 78gSensor Specification:Working Temperature: (-40℃ ~ +105℃)Stroage Temperature: (-40℃ ~ +120℃)Pressure Range: 0~116psi (0~8bar)Pressure Accuracy: 1.5PSI (0.1bar)Temperature Accuracy: 3℃Transmitting Power:10dbm@50Transmitting Frequency: 433.92MHzBattery Life:2 yearsHeight: 15mmDiameter: 23mmWeight: 9.5gPackage Included:1 X U812 Tire Pressure4 X External SensorNote: If you want an internal sensor tire pressure monitor system, please click Here.