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