... for teachers,meeting,restaurant,etc Multifunction all in one with Entertainment,Microphone, Amplifier, Loudspeaker,Music play and FM ... Single direction Frequency response 80Hz-12KHz±3dB Power supply: Lithium-ion Polymer 7.4V Product dimention: 108*90* ... , loudspeaker, microphone, reverberation Digital mini professional portable speaker with lithium battery can last stand-by time and perfect for outdoor ...