Wireless Solar TPMS LCD Car Tire Pressure Monitoring System + 4 External Sensors Description Know the real time air pressure and temperature for 4 tires on the screen. Gives you early warning of air leaks and other abnormal tire situations so corrective action can be taken and tire life can be extended. When the air pressure or temperature of any tire goes outside the predetermined range,both the monitor display and an audible alarm warn you.You’re also warned when the battery of a tire sensor is low. Specification Display screen:LCD Operating temperature: -30°C-85°C Working voltage: 3.7-5V 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*303450 3.7V 500mAh   Sensor Operating temperature: -30°C-85°C Working voltage: 3.7-5V Standby current:＜1uA Transmission frequency: 433.92MHZ+/-20KHZ Transmitted power:＞8dBm Open Distance:＞30M Battery(each sensor):1*CR1632 3V Monitor size: Approx.9.5*8.5cm Sensor size(each): Approx.2*2*2cm   Package Includes 1 x TPMS Receiver host 4 x Sensors 4 x Anti-lost nuts 1 x Hex spanner 1 x Anti-slip Pad 1 x User manual