Press the center button for 1 sec to power up; press the same button for 5 sec to power down. I feel the need to reiterate that as everyone else has as well. The first time was trial and error. The A B X Y keys are not very clearly labelled (black on black and obviously invisible once your fingers are on the buttons) so you cant see what you are pressing. Few minutes after placing the order I had realized that I had not chosen a size. I have wide feet as they have flattened out over the past few years. Sie war von der Optik ganz angetan. It?s sturdy, attractive, and perfect size. They are a bit small. and I would highly recommend it to other people.