massmall Vibrate Rock Led Bracelet Cool Vibrate Activated LED Glowing Bracelet Wristband for Party/Disco /Bar-The Louder The Virate The Brighter It'll Flash It's Lights(Pink) 1. Very Fashion design and superior quality 2.The vibrate the Noise the Brighter It'll Flash It's Lights 3.Ideal bracelet for Party /Disco /Bar 4 On/Off switch to conserve batteries. It has selectable flash mode of long or short flash 5.Various colors for you to choose