1. This is a QC3.0 smart charger, with voltage display, high voltage alarm, the charging rate can be displayed, and there is a switch to freely switch the display mode and turn on and off. 2. Lightly press the switch 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 device power 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 energy saving.3. When the input voltage exceeds 14.6V, the red 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 will flow to indicate that it is charging; it will reflect the charging speed according to the flow rate of the color screen. When