Matrix Audio MNRGPRM 3 Watts Pocket Speakers - Retail Packaging - Purple 3.5 Watts output makes it the loudest pocket speaker in the world Built in mic allows for conference calling and handsfree calling Built in rechargeable battery allows for upto 14 hours playback Answer phone calls by simply flicking toggle button to right Answer phone calls by simply flicking toggle button to right Rechargeable Fits in your pocket powerful