... ,easy to take*18W output power, sound can cover 800sq.m*Reverb/Echo function*MP3 by TF Card, USB flash disk ... 1set*Headset microphone x 1set*14650 Lithium battary x 2pcs*Audio cable x 1pc*Hanging belt x 1pc Applications Teaching, Tour ... , Training, Sports, Speech,Publication,Outdoor entertainment 2012 Belt Portable Mini Audio Amplifier Speaker with Reverb/Echo V-3