BOOM Swimmer DUO - Dirt, Shock, Waterproof Bluetooth Speaker with Stereo Pairing (Black) Waterproof, Dirt proof, Shockproof Now with stereo linking, the Swimmer Duo gives you more robust sound and better sonic range. Easily link two together and listen to each one as true left and right speakers. Loop your Swimmer around virtually any object and for a secure fit, pull the tail through the open slot and twist its end to any side. Stick the Swimmer to just about any surface with its suction cup attachment for surprisingly better bass response and even more mounting options. Take the Swimmer's tail and reconfigure it any way you see fit. It doubles as a support base so you can set it up for great sound just about anywhere.