... radio,reverberation function 2.headset mircophone 3.used for techer,guider,travler Specification:Multifunction all in one with Entertainment,Microphone, Amplifier, Loudspeaker,Music ... , Gymnastics,Teaching, Conference,Acoustic Instruments,Camping and other outdoor EntertainmentAccessories:Headset Microphone : 1 pcRecharger : 1 pcHost Machine : 1 pcWaistband : 1 pcSpecification : 1 ...