Both AA batteries so insert that the still visible pole of identification corresponds to the battery compartment. Waterproof, battery life actually very long. Switching on: press Power button (two LEDs light up) and press the button for the vibration - device vibrates. With this button you can switch the different programs: permanent vibration weak, medium, strong, and then the 4 pulsed programs (luxury!). Back to the beginning of the best by cycling. And in addition to the great features this thing is still very reasonably priced! Highly recommended!
