This is a relatively small plastic box with one red button. Press and hold the button and its on. Let go its off. The plug is European and comes with a US adapter.  There is one poorly applied decal which cites a company that sounds Chinese.  Looking at the product image the area just above the red button is the demagnetizing area. There are no instructions, warnings, information. You get to wing it. I used it to demagnetize some clock weights which were dragging the pendulum. I passed it over the weights close enough to feel the unit vibrate. After awhile it began to draw the weights to it. I tested the result using a compass and it seems to have done the job. It would of been nice to have some kind of instructions.