Note: When you receive the package and turn on the receiver, the receiver displays -- or 00, , wait for about 1 minute, and you will see the display shows the pressure and temperature of the tire. Specifications. Material: ABS Product Size: 12*6.3*2.5CM Operating frequency: 433.92MHZ Working voltage: 3.7V~5V Operating current: 6MA USB charging current: 250MA Dormant current: 4MA Storage temperature: -30~90 Operating temperature: -30~+85 Monitoring temperature range: -40~130 Vehicle Sensors Air Pressure range: 0~3. 5Bar Accuracy: 0.1Bar Number of s: 4PCS type: built-in/external Charging method: Solar/USB Display battery capacity: 650mAh Display function: Vehicle Sensors Tire Pressure, temperature, clock, calendar display screen rotates360 degrees freely upgrade the large screen display, Vehicle Sensors Tire Pressure, temperature, time, calendar can be the same screen display, easy to watch, easy to understand more information solar and USB two charging methods to improve the working time of the Vehicle Sensors Tire Pressure, the use will also be more convenient a variety of alarm modes, air leakage / high pressure / high temperature / low battery alarm function, at any time to understand the Vehicle Sensors Tire Pressure situation, to improve the safety of driving with the car start function, the display will follow the car start or standstill to automatically turn on or hibernate. No manual operation, use more intelligent, reduce power consumption rotatable bracket, multi-angle adjustment of the installation position, to meet more installation needs, can be installed in the front windshield or instrument panel Day and night as clear as before you will worry about traveling is it like this do it yourself 3 minutes to complete