CARUED Universal U903 Tire Preure Monitoring 4PCS Built-In External Mini Sensor Battery Long Time Life Alarm Auto TPMS 1.Use solar energy to get electricity,with 4 internal replaceable sensors.2.LED panel,with extra mini USB port for charging.3.Light weight design for sensor,no need to adjust to balance when the tire moving.4.Monitoring the tempreature and preure with high degree accuracy, display for 4 tires at the same time.5.Save fuel,forsee air leakage,reduce tire wearout,balance tire preure,ensure safety driving.6.RF wirele technology,can auto-alarm,when tire preure and temperature is abnormal.7.With two preure unit"PSI,BAR " and two temperature unit"," for option.8.Support tire position exchange function.9.Sensor waterproof grade:IP7.10.With Infenion chipset and anti-explosion battery.11.Sensor battery can be replaced by driver,need to return to factory to replace.