Our long-lasting sound controlled light up bracelets come with two cell batteries and should last for 20 hours or more for constant using. Features with a slide switch to turn on and turn off. The sound activated wristbands light up when music starts, it also motion controlled light up when movement is detected, such as shaking, clapping or dancing, the faster the motion is, the brighter and quicker they shine. Ideal for nightclub, bar, music concert, parties, birthdays and Halloween activities.