These micro LED units are designed to be taped to the center of a disc for night play, but can be used in a variety of creative ways. A button located in the center of the LEDs under the printed MVP logo circuit cover switches power on/off. Adhesive not included - users are advised not to remove the printed circuit cover, and we recommend using heavy-duty strapping or duct tape to secure the unit to the disc. Recommended to have heavy duty clear tape for adhesion.