This car tire pressure monitoring system is mainly used for automatic monitoring and alarming of the informations such as low tire pressure, high tire pressure, air leakage, high tire temperature and low power voltage in real time while the car is driving, and provides effective informations to the car driver. To maintains sufficient tire pressure, prevents the occurrence of puncture accidents, increase the safety of driving cars, reduce the oil consumption caused by insufficient tire pressure, and prolong the service time of tires. Features: Adopts high-sensitivity sensors and intelligent chip, quickly induction anomaly, accurate beep sound alarm. Sends the real time tire information to the monitor via wireless transmission and monitor displays the real time tire pressure and temperature. Color LCD digital display for clear display of tire information, monitor the pressure and temperature of 4 tires in real time. Equipped with tire pressure monitoring, air leakage monitoring, tire temperature monitoring function, monitoring your tires in all directions, keep tire on optimal pressure and ensures your safety. Multiple alarms design, with low air pressure warning, high air pressure warning, high temperature alarm, air leakage alarm, sensors low power alarm function. Two kinds of power supplying methods, solar recharging and USB recharging, which ensure the tire pressure monitoring system will work continuously. Intelligent start-up induction design, automatically senses the car status, it will automatically starts when the car is ignitions, no need to manually starts. With hibernation mode, it will automatic entering into hibernation mode when the car is stationary. IPX7 waterproof, no need to worried about rainy or snowy days anymore, suitable for a complex environment. High compatibility, universal design, suitable for small car, business purpose vehicle, minibus and etc.. Two types of sensors optional, you can choose built-in type or external type according to your demands. The built-in type should be installed inside of tire, and the external type should be installed on the air-valve directly. Specifications: Name: Tire Pressure Monitor Material: ABS + metal Color: black Type: built-in type, external type (optional) Monitor battery: 1 * 3.7V, 1000mAh built-in lithium battery (included) Sensors battery (according to your selection): Built-in type: 4 * CR2450 battery, 3V, 520mAh (included) External type: 4 * CR1632 battery, 3V, 120mAh (included) Operation frequency: 433.9200MHz±0.1MHz Working voltage: 2.0-3.6V(sensors); 5V(display) Working current: ≤15mA Working temperature of sensors: -40 to 125; ±2 Working temperature of display: -20 to 70; ±2 Monitoring temperature ranges: -40 to 130; ±2 Monitoring pressure ranges: 0bar-3.5bar; ±0.1bar Item size: 120 * 60 * 25mm / 120 * 2.36 * 0.98in Package size: 170 * 145 * 60mm / 6.69 * 5.71 * 2.36in Package weight: 260g / 9.17ounce Packing List: 1 * Tire Pressure Monitor 1 * Sensors