Description: Know the real time air preure 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 preure or temperature of any tire goes outside the predetermined range,both the monitor display and an audible alarm warn you.Youre also warned when the battery of a tire sensor is low.Specification:Display screen:LCD Operating temperature: -20C-85CWorking voltage: 2.1-3.5V Transmiion frequency:433.92MHZ+/-20KHZTransmiion mode:FSK Preure unit: BAR/PSICharging ways:Solar energy/USB Battery:1*303450 3.7V 500mAhDaytime operating current/Night operating current/Standby current: 30MBattery(each sensor):1*CR1632 3V Monitor size: Approx.9.5*8.5cmSensor size(each): Approx.2*2*2cmPackage Includes:external type:1 x TPMS Receiver host4 x Sensors4 x Anti-lost nuts1 x Hex spanner1 x Anti-slip Pad1x USB cable1 x User manualinternal type:1 x TPMS Receiver host4 x Sensors4 x Anti-lost nuts1 x Anti-slip Pad1x USB cable1 x User manual