Specifications and functions -Solar power charging, dont need to charge by connecting car cigarette lighter-Colorful LCD Digital displaying, clear to show tire information-Rear-time monitoring preure & temperature of 4/6 tires-Low air preure/high temperature alarm-High Temperature / Leakage / Low Battery Alarm-Intelligent Shock Boot when car moving, dont need to turn on/off-Wirele connect by sensors, easy install-Build-in sensors and external sensors options, meets all your need-Freescale chip sensors and fit on almost 98% cars on market Build-in Sensor (Optional) -Please install in by Profeional car center-More stable and accurate-Anti High Temperate and Cold-IP67 Protection / Waterproof-Working Temperature: -40-125-Battery Life: 5 YearsNot replaceable External Sensor (Optional) -Easy to install, convenient to replace-Dust-Proof / Water-Proof / Anti-theft-Anti High Temperate and Cold-IP67 Protection / Waterproof-Working Temperature: -20-80-Battery Life: 2 Years,replaceable How to replace the External Sensor battery? 1. Remove the dismantling gasket2. Wrench the shell with a wrench3. Remove the battery4. Replace a new battery. Main Feature Intelligent Solar TPMS Car Tire Preure.Accurate early warning,safer driving,more reauring. K11 suitable for 6-wheel School Bus,Mixer,Truck,Special model,SUV etc. Daily use of high conversion solar energy charging, cloudy days or underground garage parking for too long, can be USB charging. When the car is started, the vibration of the machine is automatically opened and the machine is shut down automatically when it is still, without manual operation. External Sensor Internal Sensor K10/K10P: 4 Tires sensorK11: 6 Tires sensor