... ,restaurant,etc Multifunction all in one with Entertainment,Microphone, Amplifier, Loudspeaker,Music play and FM radioSupporting USB for music ( mp3 format ) ... could heard loudly by others when you speak via headset microphone and voice amplified via speaker box .2.Music amplifier :When ... function, I will recommend you as your request . OEM wireless microphone with USB for teachig, meeting, restaurant