Polk BOOM Swimmer Jr Bluetooth Waterproof Speaker (Blue) Waterproof With an IPX7 rating, the Swimmer can be immersed in up to 3 feet of water for 30 minutes. Take it to the pool, ocean, and even the shower. Bottom line -- just soak it. 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. Flip the tail and hang the Swimmer however you see fit. 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.