This tire pressure monitoring system is easy to install and with LCD display for easy read.   Features: 4pcs internal TPMS used for 12V power cars.  Display pressure and temperature of each tire simultaneously.  Real-time monitoring tire pressure and temperature.  High / low pressure, high temperature warning.  Wireless data transmission and interference sensor.  IP67 waterproof, USB, solar energy 2 kinds of charging methods.   Specifications: Waterproof: IP67;  Monitor working voltage: 3.7V-5.5V;  Working current: ≤10mA;  Charging ways: USB, solar energy;  Temperature accuracy: 1°C;  Pressure accuracy: ±0.1bar;  Battery: 1 * CR1632, 3V, 150mAh;  Item size: 95 * 85 * 50mm / 3.7 * 3.3 * 2.0in;  Item weight: 150g / 5.3ounce;  Package size: 178 * 130 * 50mm / 7.0 * 5.1 * 2.0in;  Package weight: 250g / 8.8ounce;   Package list: 1 * Monitor;  4 * Sensors;  4 * Screws;  1 * Wrench