... waistband loudspeaker TF /SD card or USB for music with mircrophone /reverberation used for Yoga,Teaching,conference Item Name: Waistband ... loudspeakerItem No.: GSG-YB001 High lights:Multifunction all in one with Entertainment,Microphone, Amplifier, Loudspeaker, ... -8 hours Function Mp3, FM radio, Amplifier, loudspeaker, microphone, reverberationColor ChoiceBlack,Red, BlueWeight 225g ( ...