Universal TPMS Wirele Tire Preure Monitoring System Solar Power Digital LCD Display Car Security Alarm 4 External Sensor Description [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 Celsius-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 Celsius-Storage temperature: minus 40-plus 125 degrees Celsius-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 Celsius-Storage temperature: minus 40-plus 125 degrees Celsius-Battery: Built-in CR1632 120mAh button battery-Battery life: 1-2 years (replaceable battery) Package Contents: 1 x TPMS4 x External Sensor or Internal Sensor (selectable )4 x Mounting Nut1 x Wrench1 x User Manual Easy Installation Install the sensor in 5 minute 1. Screw the valve cap2. Screw in six angle nut3. Rotate the relative tires accoring to the position of the sensor4. Reverse rotating top sensor with nut wrench5. Check if the air is leaking with soapy water