Our sound controlled light up bracelets come with two replaceable cell batteries and should last for 20 hours or more for constant using. These sound activated silicone wristbands light up when exposed to sound, it also motion controlled wristbands light up when movement is detected, such as shaking, clapping or dancing, the faster the movement is, the brighter and quicker they shine. Perfect for music Concert, parties, birthdays, festivals and Halloween celebrations.
