[SOLAR POWER & USB CHARGING]: 2 charging ways which ensure the tire preure monitoring system will work continuously, and do not occupy the car cigarette lighter socket.[6 ALARM MODES]:fast leak alarm, slow leak alarm, high preure alarm, high temperature alarm, sensor fault alarm and sensor battery low power alarm, ensure safe driving. [ Pre any button will stop alarming ][DIGITAL LCD SCREEN]:the monitor displays real-time preure & temperature, it can be placed anywhere stably and you can easily read the data.[EASY TO USE]:4 wirele external sensors, easy installation and receive real-time signal. The preure and temperature data can be switched (default 0.5- 3.5 Bar), with preure unit: PSI/Bar and temperature unit: C/F selectable. TPMS receiver: -Battery: Built-in 400mAh lithium ion battery -Working voltage: DC 5V -RF transmiion frequency: 433.92MHz -Preure unit: psi / bar -Temperature unit: Deg.C / Deg.F. -Working temperature: minus 20 plus 85 degrees Celsiu -Storage temperature: minus 40-plus 125 degrees Celsiu Internal sensor: -Working preure: 0-51 psi / 0-3.5 bar -Preure accuracy: plus or minus 0.1BAR -Transmiion frequency: 433.92MHz -Working temperature: minus 20-plus 85 degrees Celsiu -Storage temperature: minus 40-plus 125 degrees Celsiu -Working voltage: 2.0-3.6V -Waterproof rating: IP67 -Battery: Built-in CR24500 button battery -Battery life: 2-5 years (not replaceable, the sensor needs to be replaced when the battery is dead) External sensor: -Working preure: 0-51 psi / 0-3.5 bar -Preure accuracy: +/- 0.1BARi -Working frequency: 433.92MHz -Working voltage: 2.0-3.6V -Waterproof: IP67 -Working temperature: minus 40 plus 85 degrees Celsiu -Storage temperature: minus 40-plus 125 degrees Celsiu -Battery: Built-in CR1632 120mAh button battery -Battery life: 1-2 years (replaceable battery)