Solar Power TPMS Car Tire Pressure Alarm Monitor System Auto Security Alarm Systems Tyre Pressure Temperature Warning. Solar power charging, don't need to charge by connecting car 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, don't need to turn on/off. Wireless connect by sensors, easy install. Freescale chip sensors and fit on almost 98% cars on market. Build-in Sensor: 1. Please install in by Professional car center 2. More stable and accurate 3. Anti High Temperate and Cold 4. IP67 Protection/Waterproof 5. Working Temperature:-40-125 6. Battery Life:5 Years External Sensor: 1. Easy to install, convenient to replace 2. Dust-Proof/Water-Proof/Anti-theft 3. Anti High Temperate and Cold 4. IP67 Protection/Waterproof 5. Working Temperature:-20-80 6. Battery Life:2 Years, replaceable 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 Colour:Black Material:ABS Package Contents: 4 x Spare battery 4 x External sensor 4 x Screw nut 1 x Wrench 1 x US8 power cabie 1 x Chinese and English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.