Use lithium battary to get electricity, with 6 pcs external sensors. Light weight design for sensor, easy to installation. Monitoring the tempreature and pressure with high degree accuracy, display for 6 tires at the same time. Save fuel, forsee air leakage, reduce tire wearout, balance tire pressure, ensure safety driving. RF wireless technology, can auto-alarm, when tire pressure and temperature is abnormal. With two pressure unit”PSI, BAR ” and two temperature unit”? , ? ” for option. Sensor waterproof grade:IP5K4K. With FREESCALE Chip and RENATA anti-explosion battery. Suits for trailer, van etc. Displayer Parameter: Working Temperature:(-20? ~+80?) Storage Temperature:(-30? ~ +85?) Input Voltage:DC 5V Transmitting Frequency:433.92MHz Size(LWH)mm:1193424mm Weight:104g Sensor Parameter: Quantity: 6 pcs Working Temperature:(-40? +105?) Storage Temperature:(-40? +120?) Pressure Range:0130psi(08bar) Pressure Precision:±1.5PSI(±0.1bar) Temperature Precision:±3? Transmitting Power.