... for teachers,meeting,restaurant,etc Multifunction all in one with Entertainment,Microphone, Amplifier, Loudspeaker,Music play and FM ... and nice loud voice, good penetration. Power output: 20W Charger voltage: 12V 1800mAh Product weight: 355g Mic directivity Single ... loudspeaker, microphone, reverberation Digital mini professional portable speaker with lithium battery can last stand-by time and perfect ...