Tire Pressure Monitoring system is high efficiency solar power panel with USB charger cable. Double charging ways can assurance the monitoring system working continuously. The wireless installation and signal receiving. Allows tire pressure and temperature data to be transmitted in real time, with strong received signals, no interference, and higher stability. The LCD display can clearly show the tire's pressure and temperature in real-time from any angle; and you can manually adjust the display backlight according to the strong and weak environment light to clearly read the screen. Type: Intelligent Solar TPMS Car Tire Pressure Battery: Built in battery Types: Internal sensors,external sensors Display Powered: solar powered, USB cable powered. Pressure Monitoring Range: 0-5.8bar Display:LCD Digital Alarm: Low air pressure/high temperature alarm External sensor: Installed on the valve core, it takes 2 minutes to complete, but it needs to be disassembled every time it is inflated Built in sensors: The valve core of the original car needs to be replaced and installed at a repair shop. it is convenient to inflate after installation. and it is than external sensors and not easy to be stolen Color: As Shown Material: Metal+Plastic Package Contents: 1 * Solar Tire Pressure Alarm System Set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.