TPMS Vehicle Sensors Tyre Pressure Monitoring System Solar Power LCD Display with 4 Internal/External Replaceable Battery PSI/BAR Mode NOTE: 1.Use solar energy to get electricity,with 4 external/internal s. 2.LED pannel,with extra mini USB port for charging. 3.Light weight design for ,no need to adjust to balance when the tiremoving. 4.Monitoring the tempreature and pressure with high degree accuracy, display for 4 tires at the same time. 5.Save fuel,forsee air leakage,reduce tire wearout,balance tirepressure,ensure safety driving. 6.RF wireless technology,can auto-alarm,when Vehicle Sensors Tire Pressure and temperature is abnormal. 7.With two pressure unitPSI,BAR and two temperature unit, foroption. 8.Support tire position exchange function. 9. waterproof grade:IP5K4K. 10.With FREESCALE Chip and RENATA anti-explosion battery. Displayer Parameter Working Temperature:(-20+80) Storage Temperature:(-30 +85) Input Voltage:DC 5V Transmitting Frequency:433.92MHz Size( L*W*H )mm:88*76.48*28.4mm Weight:57g