Features: 1.Solar and USB Charging: Two charging methods ensure higher charging efficiency, ensure that solar tire pressure monitor system can work continuously. 2.Display: With LCD high precision liquid crystal display, clear information display, whether it is day or night, you can easily read tire status data, ensure safe driving. 3.Function: Equipped with 2 tire sensors, which could accurately monitor tire pressure and tire stability, when the tire pressure is out of whack, you will get loud volume alarm. 4.High Accuracy Sensor: The tire pressure sensor has long receiving distance with stable signal, and support tire position swap, with high accuracy, sensitivity and long battery standby time. 5.Easy Installation: The package is equipped with anti theft nuts, wrenches, USB charging cables, instructions and other accessories to ensure fast installation. Specification: Item Type: Tire Pressure Monitoring System Material: ABS Receiver Parameters Receiving Frequency: 433.92mhz Power Supply Mode: Usb Power Supply, Solar Power Supply Working Voltage: DC 5v Pressure Unit: Bar/Psi Temperature Unit: C / F Operating Temperature: -20 -- 85C Storage Temperature: -40 -- 105C Transmit Frequency: 433.92mhz Pressure Range: 1.06 Bar / 0-15 Bar Default Low Pressure Alarm Values: 2.86 Bar/ 3-13 Bar Default High Voltage Alarm Value: 6 Bar/15 Bar Pressure Accuracy: 0.1 Bar / 1 Bar Operating Voltage: DC+2.0 3.6v Operating Temperature: -20 -- 85C Storage Temperature: -40 -- 125C Waterproof Level: IP67 Battery: 2pcs CR1632 Coin Cell 120mah 3.0v (Built In) Display Battery: 1 Lithium Battery 5000mah 3v (Built In) Battery Life: 1.5-2 Years PackageList: 1 x Tire Pressure Monitor 2 x Sensor 2 x Anti Theft Nut 1 x Anti Slip Mat 1 x Usb Cable 1 x Wrench 1 x Instruction Manual