To unlock it, you should press the button 5 times in sequence. It will blink to indicate that it is unlocked. For the highest performance, you should charge your Cloud no longer than 1 hour for full charge before use. The red LED will be turned on when the battery is in charging.
You can change the voltage settings by pressing the button 3 times in sequence. To use the preheat option, press the button 2 times in sequence.
Voltage settings are:
Green - 3.4V
Blue - 3.7V
Red - 4.0V
Capacity - 400mAh