Instructions for use:
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 power off when not in use.
How to charge the battery:
Attach the battery to a USB charger, plug charger in when the battery is fully charged the indicator will change from red to green.