Aker Voice Amplifier 10watts Black MR1506 by ZITRADES,Can use for Props, Electronic sound effects, MP3 player, Teachers, Professors, Ministers, Coaches, Tour guides, and Presentations etc. Super Powerful Voice Amplifier/Speaker. Size is 3.75in x 2.81in x 1.08in (90mm x 70mm x 27mm) be used MP3 speaker. The amp has a microphone input and a MP3 input. Comes with Headset microphone, Charger cable (US plug), MP3 cable (male to male 3.5mm), MP3 line in port, Microphone line in port Sound covers over 3,500 square feet. Can be worn inside a costume in many different ways.