The Polk BOOM Swimmer Duo enters a new stage of evolution, letting you double down on great sound and ultimate portability no matter where adventure leads. Sticking with its original look and rugged features, little may have changed on the outside-but what's inside tells a new story. The Swimmer Duo now includes stereo linking, giving you a more robust sound and better sonic range from all of the tunes you love via a Bluetooth connection. Add a pair of Swimmer Duo's to your arsenal, easily link them together, and listen to each one as true left and right speakers. Its new built-in mic is speakerphone-ready for those moments when you're listening to music but want to take incoming calls and keep communication hands-free. Plus, its already awesome flexible tail is now 1-inch longer, giving you endless opportunities to loop, twist, grip and set it however you see fit. And it still comes with a suction cup attachment, so you can stick it to just about any surface for surprisingly better low end response and even more mounting options.