Solar power charging, don' 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. 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: Right Select Key: Select key of menu. Menu Key: Long press into menu setting. 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 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 Deviation0.013 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 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.