CODASH Wirele TPMS Solar Car Tire Preure Monitoring System With 4 Sensors Smart Tyre Preure Temperature Warning Aalrm Receiver : Transmiion frequency: 433.92MHz Power supply mode: USB power supply, solar power supply Working voltage: DC 5V Preure unit: bar/psi Temperature unit: C/F Working temperature: -20 -- 85 Storage temperature: -40 -- 125 Receiver angle adjustment range: 0~45 Mounting bracket: split type Sensor : Transmiion frequency: 433.92MHz Preure range: 05bar / 067 psi Low preure alarm value: 1.8 bar High preure alarm value: 3.2 bar Measurement accuracy: 0.1 bar / 1.5 psi Operating voltage: DC2.0 3.6V Working temperature: -20 ~ 85 Storage temperature: -40 ~ 125 Waterproof: IP67 Built-in - Battery: Built-in CR2450 button battery Battery life: 2-3 year External - Battery: Built-in CR1632 button battery Package Included Receiver*1Sensor*4Anti-theft Nut*4Anti-Slip PadUSB CableWrench