[Real-Time Monitoring]Simultaneously measures and displays tire pressure (PSI) and temperature for up to 4 tires, providing crucial information at a glance for optimal safety and maintenance. [Dual Charging Options]Features both solar and USB charging capabilities, ensuring continuous operation under any conditions for worry-free driving. [Intelligent Power Management]Smart auto on/off mechanism activates when the vehicle starts and shuts down when stationary, conserving energy and extending battery life. [Versatile Compatibility]Suitable for various vehicles including RVs, off-road pickups, and trailers, supporting tire pressure readings up to 9.9 Bar (144 PSI) for enhanced safety and performance. [Waterproof Design]With an IPX7 waterproof rating, this tire pressure monitoring system ensures reliable performance in various weather conditions. Specifications: Main Material: ABS Main Unit Battery: Built-in 3.7V 300mAh lithium battery External Sensor Battery: Built-in CR1632 button cell Pressure Units: PSI/BAR Temperature Units: ℃/℉ Operating Temperature: -20℃ to 70℃ (-4℉ to 158℉) Waterproof Rating: IPX7 Pressure Range: 0-9.9 BAR / 0-144 PSI Transmission Frequency: 433.92 MHz Transmission Power: >10 dBm Charging Voltage: DC 5.1V