UGO V ~ 680 mAh + USB Charger Cable Operating Instructions: Press Silver button 5x to turn On/Off When you charge the battery you will see a small light next to the USB Connector showing you either Charging mode (red/green flashing) or Fully Charged (solid green) Once turned on, press 2x to Pre Heat. Press again to stop Pre Heating. Press 3x to change Voltage. It changes from Green 2.6V/Blue 3.3V/Red 4.0V