1. This is QC3.0 intelligent fast charging, with voltage display, high voltage alarm, charging rate can be displayed, and there is a switch to freely switch the display mode and power on and off. 2. Press the switch lightly to turn on the power, the real-time voltage can be displayed after the full screen lights up for 2 seconds, press the switch again to switch to the red power indicator. The two display modes can be switched freely by pressing the button, and the power of the device can be turned off by pressing and holding the switch for two seconds. After the power is turned off, it means that the device has cut off the power input, so as to achieve the effect of power saving. 3. When the input voltage exceeds 14.6V, the red indicator light is on (warning function, indicating that the input voltage is too high) 4. When the power is turned on for USB charging, the color screen flows to indicate that it is charging; it will reflect the charging speed according to the flow rate of the color screen. When the phone is fully charged, it will light up in full screen. After two minutes, it will display the real-time voltage again. A flick of the switch toggles the display mode to a separate red light. Press and hold the switch for two seconds to power off the device. Material: Plastic colour: black Package Contents: 1 x Charger 1 x Line