... Microphone for teachers,meeting,restaurant,etc Multifunction all in one with Entertainment,Microphone, Amplifier, Loudspeaker,Music play and FM ... , loudspeaker, microphone, reverberation Digital mini professional portable speaker with lithium battery can last stand-by time and perfect for ... 2.Music amplifier :When connect the computer or MP3 with the cable , the music volume could amplified by this ...