CAREUD U903 TPMS Wirele Tire Preure Monitoring System Car 4PCS Mini External Sensors No Need to Disaemble the Tires Auto 1.Use the Cigarette lighter or power line for option to get electricity. 2.With LCD display and 4 internal or external sensors,equipted with holder to adjust angle and easy to installation 3.Monitor the tempreature and preure with high degree accuracy,display for 4 tires all at once. 4.Save fuel,forsee air leakage,reduce tire wearout,balance tirepreure,ensure safety driving. 5.RF wirele technology,auto-alarm when tire preure and temperature is abnormal. 6.With two preure unit"PSI,BAR " and two temperature unit"," for option. 7.Support tire position exchange function. 8.Sensor waterproof grade:IP67 9.With FREESCALE Chip and RENATA,PANASONIC,MAXELL anti-explosion battery.