USB FM radio waistband amplifier with reverberation of sound with ... in one with Entertainment,Microphone, Amplifier, Loudspeaker,Music play and FM radioSupporting TF card or USB for music ( mp3 format ... FM radio, Amplifier, loudspeaker, microphone, reverberationColor ChoiceBlack,Red, BlueWeight 225g ( including battery )Size125*87.5*51.5mmApplication: Used for Yoga, Gymnastics,Teaching,Promotion ...