Easy Installation, Quick Alarm: The tire pressure monitoring system offers five alarm modes, including quick air leak alarm, high/low pressure alarm, high temperature alarm, and low battery power alarm for the sensors. The sensors are programmed with the monitor after production; you only need to set your desired safe pressure and temperature values. Alarm safety ranges are -25%PSI to +25%PSI for reference pressure and -25%F to +25%F for reference temperature. The alarm will be triggered when the monitored data falls outside the safe range. [Solar and USB Charging] This tire pressure monitoring system supports both solar and USB charging. Utilizing high-quality solar lithium battery panels, the monitor features excellent automatic charging and storage capabilities, extending its service life and ensuring it operates continuously for drivers. USB charging is also supported, complete with a USB charging cable for added convenience. If the display power flashes in sufficient sunlight, please use the provided USB cable for charging. [Various Alarm Modes and Automatic Alarm Value Settings] The tire pressure monitoring system provides safety alerts such as high/low pressure alarms and high temperature alarms. Upon installation of the tire sensors, the monitor automatically configures the current pressure as a reference point, requiring no manual settings for high and low pressure alarm values, offering a smart and convenient experience. Due to variations in production, some accessories may appear slightly different, but this will not impact functionality. Working voltage: 3.7V Working temperature: 70°C Waterproof level: IPX7 Pressure range: 0-6BAR Transmitting frequency: 433.92MHZ Transmitting power: 10dBm Charging voltage: DC 5.1V Colour: Black Material: Plastic Package Contents: 1x display screen 4x sensors 1x charging cable 4x nuts 1x wrench Only the above package content; other products are not included. Note: Light reflection and different displays may cause color differences in the item compared to the picture. Measurement tolerances allow for an error of +/- 1-3cm.