About this product

Digital Screen Shows The Actual Battery Level Battery Capacity - 650mAh Voltage - 2.8/ 3.4V/ 4.0V Charging Port - Type -C How to use: Press the button 5 times to switch in or off. The indicator light will remain on for one second to indicate the power-on and power-off state. No automatic shutdown function. Press the button or rapid draws 2 times within 1.5 seconds to preheat. Press the button or rapid draws 3 times within 1.5 seconds to adjust the voltage.