Features: 1Power Supply Mode: Built in solar panel and battery, support USB cable charging and solar charging, ensuring that the tire pressure monitoring system can work continuously. 2Function: Monitor the real time tire pressure and tire stability monitoring through 4 external sensors, IP67 waterproof, sealed against dust, avoid a variety of harsh climates, with high accuracy. 3Tire Pressure Monitor: Equipped LCD high precision liquid crystal large screen display, which has loud volume alarm sound warning, with working voltage of DC 5V. 4High Performance: Various tire pressure units are optional, the tire pressure monitoring system has long receiving distance, stable signal, and support tire position swap. 5Built in Battery: Built in 4 CR1632 button batteries in the sensor, and the display is built in lithium battery, long battery life, suitable for all kinds of cars, trucks, RVs. Package included: 1 x Tire Pressure Monitor 4 x Sensor 4 x Anti Theft Nut 1 x Anti Slip Mat 1 x Usb Cable 1 x Wrench 1 x Instruction Manual