- On/Off – Press button 5x
- Variable Voltage – Press button 3x to adjust voltage: Green=3.4v, Blue= 3.7v, Red 4.0v
- Preheat Function – Press button 2x to preheat. Press button 1x to stop preheat
- Battery Level Indicator – Press button to see battery level: Green=Full, Orange=Medium, Red=Low
- Turn the power off when not in use.