ePark Led Light Up Bangle Bracelet LED Wristband Voice Activated Stick for Party Concert Raves Club Carnival Festival Night Activity Running Jogging Cycling Dog Walking LED glowing bracelet light up wristband for Party Disco Bar music concert carnival Christmas Easter Day Halloween etc Reflective gear at night for safety, good for night outdoor sports, fit for adult, kids, pet, senior people etc. Bracelet diameter is about 2.17 inch The brightness and flash speed of the LED light will change according to the sound rhythm 2pcs CR2016 cell battery, user can replace cell easily after run out Great multifunction flashing wristband, 365 days useful White, Blue, Green, Red, Orange, Pink colors available