CODASH Clock Car Tire Preure Monitoring Automatic TPMS Sensor Automobile Tyre Preure Monitor System External Sensors for 4 Wheel Receiver: -Battery: 400mAh (built-in) -Working voltage: DC 5V -RF transmiion frequency: 433.92MHz -Preure unit: psi / bar -Temperature unit: Deg.C / Deg.F. -Working temperature: -20~85 -Storage temperature: -40 ~125 Internal Sensor: -Working preure: 0-51 psi / 0-3.5 bar -Preure accuracy: 0.1BAR -Transmiion frequency: 433.92MHz -Working temperature: -20~85 -Storage temperature: -40~125 -Working voltage: 2.0-3.6V -Waterproof rating: IP67 -Battery: Built-in CR24500 button battery (not replaceable) External Sensor: -Working preure: 0-51 psi / 0-3.5 bar -Preure accuracy: +/- 0.1BARi -Working frequency: 433.92MHz -Working voltage: 2.0-3.6V -Waterproof: IP67 -Working temperature: -40~85 -Storage temperature: -40~125 -Battery: Built-in CR1632 120mAh button battery (replaceable)