Hign-concerned Chemical:None Material:Car Tire Pressure Alarm System Model Number:TPMS Origin:Mainland China TPMS:Wireless Tire Pressure Monitoring System Tyre Temperature Alarm Warning System:Tire Pressure Sensor Smart Car TPMS:Car Tire Pressure Alarm System Auto Security Alarm System:Alarm Tire Pressure Sensor Auto Security Temperature Alarm System:Car Tyre Pressure Monitor Origin:Mainland China Display:3-digit display, more accurate Radio frequency transmission frequency:433.92MHz Pressure unit:psi / bar Temperature unit:Deg.C / Deg.F. Transmission frequency:433.92MHz Waterproof grade:IP67 Working pressure:0-80 psi / 0-6 bar,0-80 psi / 0-6 bar Pressure accuracy:plus or minus 0.1 BAR,+/-0.1BAR Working frequency:433.92MHz Working voltage:DC 5V,2.0-3.6V,2.0-3.6V Waterproof:IP67 Working temperature:minus 20 plus 85 degrees Celsius,minus 20-plus 85 degrees Celsius,minus 40 plus 85 degrees Celsius Storage temperature:minus 40-plus 125 degrees Celsius,minus 40-plus 125 degrees Celsius,minus 40-plus 125 degrees Celsius Battery:Built-in 300mAh lithium-ion battery,Built-in CR2032 Wansheng button battery,Built-in CR1632 120mAh button battery Battery life:2-5 years,1-2 years (replaceable battery) Packing size:160x140x60mm/6.3x5.51x2.36inch