Waistband portable teaching microphone headset,usb,tf card slot, mp3 ,fm radio,microphone,reverb used for ... Microphone, Amplifier, Loudspeaker,Music play and FM radioSupporting TF Card and USB for music ( mp3 format )With USB ... including battery )Size128*50*85mmApplication:Used for Yoga, Gymnastics,Teaching, Conference,Acoustic Instruments,Camping and other outdoor EntertainmentAccessories:Headset ...