Portable Voice Amplifier, ELEGIANT 20W Powerful Ultra-Clear Rechargeable Amplifiers with Wired Headset Microphone Waist & Belt Clip for Tour Guides,Teachers,Kindergartner,Coaches,Presentations Black Digital Audio: This voice amplifier has a clear sound quality and high sensitivity due to its digital audio processing. It sounds very loud, clear, low feedback, covering more than 4300 square feet. Fully Charged Battery Life: 15-20 hours, 6 hour recharge, 2-3 year life (replacements available). Portable Design: This is a small super-function voice amplifier / loudspeaker, due to its small size, it is also very suitable for wearing on your belt. MP3 and Music Player: It can be used as MP3 speaker. The amp has a microphone input and a MP3 input, it can even play music while you input the microphone, and it becomes a mini karaoke system. Package Includes: Equipped with voice amplifier, headset microphone, charger cable, strap.