PolarPro BeatPulsar Compact Speaker for OtterBox Universe Case;

Amplify the power of your phone's Built-in speakers with the beat pulsar.  The beat pulsar is a powerful yet Compact, portable Dual speaker system designed exclusively for otterbox’s Universe case system.  Otterbox’s Universe case features a removable accent plate on the back of the case, allowing the beat pulsar to easily slide on and off, so you can take your party to-go. The Dual speaker system is powered by a Built-in, rechargeable battery, so that you don't drain your phone's battery while you jam at the beach or on trail, and is powerful enough to provide up to 8 hours of constant playback, so you can turn up the Volume all day and into the night.  When the battery is running low, quickly recharge using any USB port, with the included charge cable. Equipped with a Built-in Microphone, the beat pulsar is also a great tool to have at the office.  Use it for conference calls, or maybe a little afternoon Jazz at your desk as you work.  It's also great for putting your friends on blast who didn’t make the weekend retreat, and is Compatible with all Bluetooth devices.  No more auxiliary cord. Unlike your old Boombox, the beat pulsar features a slim profile, designed to fit in your pocket or small bag, so you can take it anywhere you take your phone.  At just 3.5 ounces, the beat pulsar is also much lighter, and while it won't play a Cassette, it provides a Stellar stereo sound. So take your party to-go with the beat pulsar, and ditch the clumsy Boombox.  You won't miss it, really.