Battery: 650mAh Charging Port: Type-C Various Voltage: 2.8V / 3.4V / 3.8V To Adjust Voltage: Rapidly press the button 3 times within 1.5 seconds to change voltage Green Light Indicates: 2.8V Blue Light Indicates: 3.4V Red Light Indicates: 3.8V Preheating: Rapidly press the button twice within 1.5 seconds to preheat. Power On/Off: Rapidly press the button 5 times to power on, the switch light will flash once. Press button 5 times rapidly to power off, the device will not automatically power off.