See if this helps...
Just like the Vamo V5 It has 3 buttons, A firing button, A power up & a power down button, five clicks of the firing button will turn the device on or off, Hold down the left power button and it will tell you the current voltage of the battery, Hold down the right button and it will give you the resistance of the coil in Ohms, Hold both left and right buttons down and you will enter the menu, Once in the menu you can select voltage or power (wattage) as the method of output control and choose what the display shows when you fire the device (coil ohms, battery power or power output) the E-Huge is compatible with the USB output adaptor that we stock so you can charge your USB devices from it, to activate this just screw on the adaptor and hold down the left button until it turns on, to stop the output you just press the firing button.