Feature: 1. Power 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. 2. Function: 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. 3. Tire Pressure Monitor: Equipped LCD high precision liquid crystal large screen display, which has loud volume alarm sound warning, with working voltage of DC 5V. 4. High Performance: Various tire pressure units are optional, the tire pressure monitoring system has long receiving distance, stable signal, and support tire position swap. 5. Built 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. Specification: Item Type: Tire Pressure Monitoring SystemMaterial: ABSReceiver 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 Working Temperature: -20 -- 85°C Storage Temperature: -40 -- 125°C Tire Pressure Detector Parameters: Transmit Frequency: 433.92mhz Pressure Range: 0 – 3.5 Bar / 0 – 50 Psi Default Low Voltage Alarm Value: 1.8 Bar Default High Voltage Alarm Value: 3.2 Bar Pressure Accuracy: ±0.1 Bar / ±1.5 Psi Operating Voltage: Dc+2.0 – 3.6v Operating Temperature: -20 -- 85°C Storage Temperature: -40 -- 125°C Waterproof Level: IP67 Battery: 4 x CR1632 Coin Cell Batteries 120mah 3.0v (Built In) Display Battery: 1 Lithium Battery 5000mah 3v (Built In) Battery Life: 1.5-2 years Applicable Models: Cars, Trucks, RVs. Package List: 1 x Tire Pressure Monitor4 x Sensor4 x Anti Theft Nut1 x Anti Slip Mat1 x Usb Cable1 x Wrench1 x Instruction Manual