1、Solar tire pressure monitor, built‑in rechargeable battery, supports solar automatic charging, and can also be charged via USB. 2、It supports up to 5 tires (spare tires), and the display shows the pressure or temperature of the 4 tires at the same time. 3、With pressure/temperature detection and warning, leaks alarm. Dual alarm of display and sound, good warning effect. 4、Users can set the tire pressure and temperature alarm standard values, which can meet different needs. 5、Selectable PSI/BAR of pressure transmitter. And the ℃/℉ unit of temperature can be selected. 6、The display automatically turns on, and it also has a vibration wake‑up function. Easy to install and stable performance Item Type: Tire Pressure Monitor Material: ABS+Nylon Fiber+Copper Nozzle Tire Pressure Monitor: Frequency: 433.92MHz±20.00MHz Working Temperature: -20℃-80℃ Storage Temperature: -30℃-85℃ Lithium Battery: 280mAh (built-in) Charging Method: USB+Solar Charging Voltage: DC 5V Factory Default High and Low Pressure Values: 3.0Bar-2.0Bar Working Current: ≤ 5MA Factory Default Temperature Value: 68℃ Installation Location: Center Console Waterproof And Dustproof Rating: IP67 Sensor Parameters: Frequency: 433.92MHz±20.00MHz Sensor Pressure Range: 0-3.5BAR Storage Temperature: -30℃~85℃ Accurate Pressure: +/-0.1Bar Accurate Temperature: +/-1℃ External Working Temperature: -20℃-80℃ Built-In Working Temperature: -40℃-+120℃ External Battery: CR1632 (include) Instructions for Use: Plug and play 1 x Tire Pressure Monitor 4 x Sensors 1 x Manual 1 x Wrench 4 x Nuts 1 x Tape