Please note!!! When you receive the package and turn onthe receiver, the receiver displays -- or 00, please dont worry. You only need to mount the on the tire, wait for about 1 minute, and you will see the display shows the pressure and temperature of the tire. Type: Jansite Intelligent SolarCar Vehicle Sensors 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 Vehicle Sensors 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 s, easy install -Build-in s and external s options, meets all your need Two units (PSI / Bar) changeable, you can set the one you like. Build-in ( Option ) - 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, replaceable External ( 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, replaceable Risk early-warning Accurate early warning, safer driving, more reassuring Intelligent On and Off 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. 1+1 charging mode Solar charging +USB charging Suitable for many kinds of cars Suitable for Cars, ORV, SUV, MPV, Minibus, Wagon, etc. The difference between built-in and external Q: What is TPMS? A: It is Vehicle Sensors Tire Pressure Monitoring System and also call Vehicle Sensors Tire Pressure . Make alarm and show car tires pressure and temperature. Q: How to install s? A: We suggest to install the build-in s by professional car center; external one install can read our page and manual for reference. Q: Does the solar charging work for cloudy day? A: Yes. Normally, full solar charging can work for 3 days and it can work in cloudy and fog days. Q: Can it work in snow day? A: Yes. If theshow N5 Alarm, Please dont worry and just drive the car for a distance make tires moving. It will be ok. The external s will be affected by cold environment, just need to running cars. Q: Does it need to connect car cigarette lighter for charging? A: No. Normally it will charge by solar, but if you meet a very bad weather for a long time or need urgent charge, you can use the USB for charge. (USB not included) Q: Does it need to turn on/off the TPMS? A: No. It will turn on by shock boot and turn off if there is no shock for 10 minutes.