How to replace the battery? Please note!!!When you receive the package and turn on the receiver, the receiver displays ''--'' or ''00'', please don't worry.You only need to mount the sensor on the tire, wait for about 1 minute, and you will see the display shows the preure and temperature of the tire.Type: Solar TPMS Car Tire Preure Monitor System-Solar charging, don't need to connect car cigarette lighter to charge-Color LCD digital display for clear display of tire information-Monitor the preure and temperature of 4 tires in real time-Low air preure/high temperature alarm-High Temperature / Leakage / Low Battery Alarm-Intelligent Shock Boot when car moving, don't need to turn on/off-Wirele connect with sensors, easy install,attached to gla-Internal sensors and external sensors options, meet all your needs-Two units (PSI / Bar) changeable, you can set the one you like.External Sensor ( Option )- Easy to install, convenient to replace-Dust-Proof / Water-Proof / Anti-theft-Anti High Temperate and Cold-IP67 Protection / Waterproof-Working Temperature: -20-85-Battery Life: 2 Years, replaceableRisk warning all the timeNow the condition of the wheels under control, guard you every timeTPMS will turn on when the car is moving and will turn on when the vibration starts. It does not need to be turned on or off by yourself.Solar Charging/USB ChargingNew energy solar charging provides working power. High power transmiion and performance.Color digital displayColor digital display shows different colors of tire preure and tire temperature, making it clearer and easier to read. The real-time monitor prevents the car from being dangerous due to abnormal tire preure.Sensor is suitable for most carsIP67 waterproof rating, no need to worry about high preure car wash, flooding, dustproof, high temperature and low temperature. The sensor is suitable for most cars on the market.