Feature: 1. Tire Pressure Monitoring System lets you get real time tire pressure data, temperature data and status, always keeping an eye on car performance. 2. Combined with the solar display that is green, low carbon and renewable, enabling you to charge the device faster and conveniently. 3. 4 wheels' tire pressure and temperature display simultaneously, high/low tire pressure alarm, high temperature alarm and air leakage condition alarm. 4. The real time tire pressure data, alarm system delivers alerts once an unusual situation occurs, very convenient and practical. 5. Adopts wireless transfer, and no wire connection required, easy installation, as well as easy operation. Specification: Specifications: Display: Display screen: LCD Operating temperature: -20℃ ~ 80℃ Working voltage: 3.5-4.2V Daytime operating current/Night operating current/Standby current:＜20mA/＜4mA/＜50uA Transmission frequency: 433.92MHZ+/-20MHZ Working current: ≤15MA Standby current: ≤50UA Transmission mode: FSK Pressure unit: BAR/PSI Charging ways: Solar energy/USB(USB cable is not included) Battery: 1 * 402040 3.7V 300mAh Display size: Approx.9.5*3*1.5cm Display weight (with solar panel): Approx.71g Sensor: Operating temperature: - 20℃ ~ 80℃ Working voltage: 2-3.6V Standby current:＜1uA Transmission frequency: 433.92MHZ+/-20MHZ Transmitted power:＞8dBm Open Distance:＞30M Battery(each sensor): 1* CR1632 3V Sensor size(each): Approx. 2*2*2cm. Package List: 1 * Displayer 4 * Internal Sensors 4 * Cycle Valves 1 * Non slip Mat 1 * Bag of Screws 1 * User Manual (English)