How to use this product correctly 1. Long press Left button to wake up Machine. 2. Wake up the machine at first, then install sensors on wheel. (In this way, the machine can read data from sensors immediately) If you install the sensors at first, and wake up the machine, you need to run your car for a while no more than 30 minutes. Type: Intelligent Solar TPMS Car Tire Pressure-Solar power 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 -Build-in sensors and external sensors options, meets all your need -Freescale chip sensors and fit on almost 98% cars on market Specification: Solar power charging LCD displaying Adhere to windscreen for installation Operating frequency: 433.92Mhz ± 50KHz Operating voltage: 3.7-5 V Working temperature: -20 ℃ -75 ℃ Pressure Range: 0.5 - 3.5 Bar TPMS Tire Pressure Monitor- early-warningAccurate early warning, safer driving, more reassuring TPMS Tire Pressure Sensor-Suitable for many kinds of carsSuitable for Cars, ORV, SUV, MPV, Minibus, Wagon, etc. Questiosns Answers 1. How to turn on the device? When you receive the device, please charge it for 3 hours, then, long press left button to turn on the device. 2. The sensor is showing0.0 or -, what can I do?Under this situation, we should try to install the sensors again or pair the sensors to the display again.If you dont know how to do pairing, please check the manual or contact us, we will guide you. 3. Whats the difference for external sensors and built-in sensors? -External sensors are easy to install, they have 0-0.2 reading difference.The battery inside is replacable, battery is about 1 years, battery type is CR1632. -Built-in sensors could detect accurate reading, battery is not replacable, battery is about 4-5 years. 4.Whats the pressure tange? The range is 0.5-3.5 bar5. Whats the unit using in this device? Bar or Psi, the unit could be switched to the one you like.