Solar power charging, don't 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. When the car starts, the display screen will sense the vibration of the car and automatically start. When stationary, it will automatically shut down without manual operation. Introduction of the key: ① Right Select Key: Select key of menu. ② Menu Key: Long press into menu setting. ③ Left Select Key: Long press to turn on/off, Select key of menu. Wireless connect by sensors, easy install. Two units (PSI/Bar) changeable, you can set the one you like. Type:Intelligent Solar TPMS Car Tire Pressure External Sensor: Working pressure:0-6.5bar 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 Attention: Please charge first to activate the battery. After you receive the goods, please charge it about 3-4 hours to activate the battery. Because in the process of transportation, the TPMS will automatically start to work and run out power. Type:External Sensor Colour:As Shown Material:ABS Package Contents: 1 set * Car Tyre Pressure Monitoring System 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.