Specification Long Battery Life: The external sensors also includes the replaceable battery (CR1632 180m - Ah) that be used for about one year. Real-time Wake up/ Alarm: Providing visual warning light and audible alarm immediately when tire’s pressure or temperature thresholds are exceeded. LCD Display: The tire pressure monitoring system allows you to monitor 4 tires by using an easy-to-see LCD display. Multi Function: USB Rechargeable, LCD Brightness adjustable, IP67 Waterproof. Feature of the host: Material: Plastic Working voltage: 3.7-5V Storage temperature: 30 ° C -90 ° C Working temperature: -30 ° C -85 ° C RF transmission frequency: 433.92MHz +/ 20KHz Monitoring mode: LCD color display Working pressure: 0-51 PSI Bright working current: ≤6m - A Black working current: ≤3m - A Size: 52* 50 *38MM/2 * 1.9 * 1.4 inches Factory default: pressure 29-44 PSI Solar panel battery capacity: No solar panels Transmission mode: FSK Feature of Sensor: Battery life: 24 months Working voltage: 3V Storage temperature: 30 ° C -90 ° C Working temperature: -30 ° C -85 ° C Temperature resolution: +/ 2°C (25°C) Pressure range: 0-3.5 bar Waterproof rating: IP67 Transmitting power: ≤10d - Bm Size: 21 * 17 MM / 0.83 * 0.67 inches Transmitting frequency: 433.92 MHz Lithium battery: CR1632 Certification: CE / ROHS / FCC QC test before transportation: 100% comprehensive inspection Package Contents: 1x Tire pressure Monitor 4x Sensors 1x Wrench 1x USB Charger 4x Nuts Note: If there is any sensor can not display on the screen, it might have a problem with the sensor battery, you can replace the battery: Use a small wrench to clamp the six corners of the sensor and turn it clockwise. Then change it to an new 1632 model button battery.