【Real-Time Data Display】This tire pressure monitoring system simultaneously measures and displays pressure (PSI) and temperature (℉) for up to 4 tires, providing drivers with crucial information at a glance for optimal safety and maintenance. 【Dual Charging Options】Featuring both solar and USB charging capabilities, this TPMS ensures continuous operation under any conditions, offering peace of mind during your travels. 【Smart Power Management】The system incorporates an intelligent auto on/off mechanism, activating when the vehicle starts and shutting down when stationary, conserving energy and extending battery life for worry-free driving. 【Comprehensive Tire Monitoring】Suitable for a wide range of vehicles including RVs, off-road pickups, and trailers, this solar-powered TPMS supports pressure readings up to 9.9 Bar, enhancing safety and performance. 【Easy Installation】Equipped with external sensors, this tire pressure monitor can be installed quickly and easily in just 2 minutes, without the need for tire removal, wiring, or complex balancing procedures, making it user-friendly for everyone. Specifications: Main material: ABS Host battery: built-in 3.7V 300mAh lithium battery External sensor battery: built-in CR1632 button battery Screen pressure unit: PSI/BAR Screen temperature unit: ℃/℉ Working temperature: -20℃ to 70℃ Waterproof level: IPX7 Pressure range: 0-9.9BAR/0-144PSI Transmitting frequency: 433.92 MHz Transmitting power: >10 dBm Charging voltage: DC 5.1V