USB FM radio waistband amplifier with reverberation of sound with headset microphone used for yoga,tour guide, ... lights:Multifunction all in one with Entertainment,Microphone, Amplifier, Loudspeaker,Music play and FM radioSupporting TF card or USB ... working time Keep working in 7-8 hours Function Mp3, FM radio, Amplifier, loudspeaker, microphone, reverberationColor ChoiceBlack,Red, BlueWeight 225g ...