Features: *Tire Pressure Monitoring System lets you get real-time tire pressure data, temperature data and status, always keeping an eye on car performance. *Combined with the solar energy display that is green, low carbon and renewable, enabling you to charge the device faster and conveniently. *4 wheels' tire pressure and temperature display simultaneously, high/low tire pressure alarm, high temperature alarm and air leakage condition alarm. *The real-time tire pressure data, reliable alarm system delivers alerts once an unusual situation occurs, very convenient and practical. *TPMS adopts wireless transmission, and no wire connection required, easy installation, and it automatically sleep when there is no vibration. Specifications: Monitor: 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+/-20KHZ Transmission mode: FSK Pressure unit: BAR/PSI Charging ways: Solar energy/USB(USB cable is not included) Battery: 1 * 402040 3.7V 300mAh Monitor size: Approx.9.5*3*1.5cm Monitor weight (with solar panel): Approx.71g Sensor: Operating temperature: - 40℃ ~ 125℃ Working voltage: 2-3.6V Standby current:＜1uA Transmission frequency: 433.92MHZ+/-20KHZ Transmitted power:＞8dBm Open Distance:＞30M Battery(each sensor): 1* CR2050 3V 330mAh Sensor size(each): Approx. 6.5*3.6*1.5cm Sensor weight(each): Approx.30g Package Size: 21*15*6cm / 8.27*5.91*2.36in. Package Weight: 282g Package List: 1 * Displayer 4 * Internal Sensors 4 * Cycle Valves 1 * Non-slip Mat 1 * Bag of Screws 1 * User Manual (English)