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.<br><br>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 Internal Sensor: Please install in by Professional car center More stable and accurate IP67 Protection / Waterproof Anti High Temperate and Cold Working Temperature:-40℃-125℃ Battery Life:5 Years Working Frequency:433.92MHZ Working humidity:Max95% Tire monitoring range value:0bar-6.5bar Deviation±0.013 Transmit power:R & D environment test below - 17db 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:Internal Sensor Colour:As Shown Material:ABS<br><br>Package Contents: 1 set * Car Tyre Pressure Monitoring System<br><br>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.