The JBL Xtreme 4 portable waterproof speaker offers huge JBL Pro sound with amazing dynamics, thanks to two powerful woofers and two tweeters. The handy shoulder strap makes it easy to carry, while it has durable rubber bumpers and IP67 certification. Connect two Xtreme 4's together for stereo sound. Up to 24 hours of playback and a handy power bank for this device means you won't need a recharge until morning.