AGPTek KY03 Portable Voice Amplifier, with Adjustable Waist/Neck Band&Comfortable Microphone Headset, for Coaches, Teachers, Tour Guides, Black Small Super Powerful Voice Amplifier:Plug an external speaker (wired) microphone into the MIC port for sync-chronic speaking, the sound effect is really loud & clear. Compact & lightweight: Comes with adjustable waist or neck band and a removable belt clip,Comfortable and Perfect for Teachers, Coaches, Tour Guides, Presentations ect Music enjoyment:You can enjoy your music in your Micro SD/USB Card(Not more than 32GB) via its jack on the device or you can also enjoy your music from your MP3 and phone( via a 3.5mm audio cable.It also support fm radio Repeat playing : It is considerable designed that you can tap the repeat button to repeat one and hold it to repeat all when enjoy your music. Built-in rechargeable Li-ion battery, 10 hours of continuous use after a full charge.