The JBL Xtreme 4 is a portable Bluetooth speaker with powerful, immersive sound from dual woofers and tweeters, a rugged IP67 waterproof and dustproof design, and a 24-hour battery life that can be extended by up to 6 hours with the "Playtime Boost" feature. It also features Auracast for multi-speaker connectivity, a built-in power bank for charging other devices, and a removable shoulder strap for easy portability.