... big power waistband teaching tour guide speaker with Reverb/EchoFeatures*Mini size,easy to take*18W output power, sound can ... hours and works up to 15 hours*Choice of usage: belt chip, neck hanging & waist band Specifications*Max output: 18W ... guiding, Morning exercise, Training, Sports, Speech,Publication,Outdoor entertainment 2012 Belt Portable Mini Audio Amplifier Speaker with Reverb/Echo V-3