Specifications and functions -Solar power +USB charging, dont need to charge by connecting car cigarette lighter; -Colorful LCD Digital displaying, clear to show tire information; -Rear-time monitoring pressure & temperature of 4 tires; -Low air pressure/high temperature alarm; -High Temperature / Leakage / Low Battery Alarm; -Intelligent Shock Boot when car moving, dont need to turn on/off; -Wireless connect by sensors, easy install; -Internal sensors and external sensors options, meets all your need; -Two units (PSI / Bar) changeable, you can set the one you like. Main Features Intelligent Solar TPMS Car Tire Pressure Solar Charging + USB Charging Accurate early warning,safer driving,more reassuring. Can Adapt To Various Environments Suitable for many kinds of cars Suitable for Cars, ORV, SUV, MPV, Minibus, Wagon, etc. Risk Warning The receiver can display the time and monitor the tire pressure and temperature in real time! Rapid induction abnormality, beep early warning! Real-Time Monitoring Screen display can clearly display 4 tires"'" pressure andtemperature in real-time to ensure driving safety K19/K19P How to set the time? How To Choose Sensors ? 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(4 backup batteries). Internal Sensor ( Optional ) -Please install in by Professional car center; -More stable and accurate; -Anti High Temperate and Cold; -IP67 Protection / Waterproof; -Working Temperature: -40-125; -Battery Life: 5 Years(Battery can"'"t be replaced). K19/K19P Product Display K01 Product Display How to replace the External Sensor battery? 1. Remove the dismantling gasket 2. Wrench the shell with a wrench 3. Remove the battery 4. Replace a new battery.