Features: 100% brand new and high quality Built-in vibration sensor, the car automatically turns on when starting, and automatically turns off when the car stops. Function: prevent tire burst, real-time monitoring, reduce wear, save fuel, solar energy, leak alarm. This product uses solar energy to charge,you can also use car USB or mobilephone charging cable. Wireless connect by external sensors, easy install. With four sensors, it can detect car tire pressure in all directions. Package Includes: 1x Tyre Pressure Gauge 4x Sensor Specifications: Material:Plastic Size:Approx.9.3x8.5cm/3.66x3.35in Net Weight:185g note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.