4 external/internal sensors, built-in CR1632 3.7V cell, monitor frequency: 433.92MHz. Real-time monitoring per 3s, can monitor pressure and temperature at any time. Reduce driving risks and fuel consumption, prolong lifetime of tires. Electronic pressure detection, high accuracy. Abnormal status alert, flash and icon alert, alarm can be set. Lightweight design of emitter, wide angle screen design, portable and convenient. Support English / Chinese language. Monitoring battery voltage of vehicle. 2 options of pressure unit: PSI / Bar. Suitable for Toyota (Embedded, Size: 34mm x 23.5mm x49mm). Battery life: 35 years (can be used 35 years while drive 3-4 hours a day). Pressure testing range: 08 BAR (016PSI). Temperature testing range: -40? +125? (Internal Sensor). 40? +85? (External Sensor). Transmission frequency: FSK433.92MHZ. Product is only suitatble for car series pressure range with 8 bar. Safety of car tyre can not be relyed on products all. Driver should periodically check the tires, make sure the tire puncture, cut, drum kits and other inqury-free. When product warn, car should be stopped as soon as possible and deal with it. Product cannot predict sudden tire damage caused by external forces. Don’t operate this product while driving. Sensor battery life associated with mileage of the car. 1 x Power Line. 1 x User Manual. 2 x Open- wrench. 4 x Lock Nuts. 4 x External Sensors. 4 x Internal Sensors.