... waistband amplifier with USB with USB or TF card slot with headset microphone used for yoga,tour guide,teaching Item Name: Waistband ... loudspeakerItem No.: GSG-YB001 High lights:Multifunction all in one with Entertainment,Microphone, Amplifier, Loudspeaker ... in 7-8 hours Function Mp3, FM radio, Amplifier, loudspeaker, microphone, reverberationColor ChoiceBlack,Red, BlueWeight 225g ...