Touch switch Car Tire Pressure Monitor System Voice Alarm Solar Car Tyre Pressure Monitor System With 4 External TPMS Sensor Product Description: 1. High-efficiency solar panels have super serial number capability. 2. Large-capacity built-in metal lithium battery, unimpeded battery life in cloudy days. 3. Accurately monitor the tire pressure stability value throughout the process. 4. Touch switch, super long life. 5.High volume alarm sound warning. 6.A variety of tire pressure units are available. 7. Long receiving distance and stable signal. 8.Support tire position interchange. Air pressure setting range: 1.0~3.5BA Temperature setting range: 40~68 Working temperature: -20~80 Storage temperature: -30~85 Power voltage: DC 5V Frequency: 433.92MHz20.00MHZ Pachage Include; 1x TPMS Tyre Pressure Monitoring System 4x external sensors some screws and wrench 1x users manual. 1x usb cable( power 5V by using car charger)