Features: Solar Powered and USB Charging, IP67 Waterproof, LCD Display, Tire Alarm, Pressure and Temperature Unit Optional. Specification: Working Voltage: 3.7-5V, Storage Temperature: -30°C-90°C, Operating Temperature: -30°C-85°C, RF Transmission Frequency: 433.92MH±50khz. Package Includes: 1×Tire Pressure Monitor, 4×External Sensor, 1×Anti-Slip Pad, 4×Anti-Theft Nut, 1×Wrench, 1×User Manual, 1×USB Cable.