To activate your LED Mario Mushroom USB Lamp, press down on top & watch the soft light pop on. Push down again to power off. Light shines steady; NO flash. LED Color: White Mushroom Dimensions (WxH): 3″ x 3.25″ USB Cable Length: 38″ Comes ready to use with USB cable. You have the option to fill it on your own with 3 AAA Batteries if you prefer.