External sensor, easy and convenient to install. IPX7 waterproof, safe and reliable barrier, effectively ensuring use. Simultaneous monitoring of tire temperature and tire pressure. Wireless intelligent transmission sensor. Strong signal, anti-interference and data retention. Solar powered and USB dual charging design effectively ensures battery life. Voice prompts and broadcasts, effectively grasp at any time. Applicable car models, automobiles, small cars, tire pressure range of 0-5BAR. Product Name: Tire Pressure Monitor. Transmission frequency: 433.92MHz. Transmission power:> 10dBm. Charging voltage: DC 5.1V. Working voltage: 3.7V. Working temperature:- 20? -70? Display screen size: 9.38 8.85 2.85cm. Sensor battery model: CR1632. Sensors corresponding to tires: LF left front, RF right front, LR left rear, RR right rear. During installation, first tighten the gasket onto the air nozzle, then tighten the sensor, and finally secure the gasket to the sensor. If the sensor cannot be displayed on the screen, use a wrench to disassemble the sensor and reinstall the battery. Install gasket screws 4.