The JBL Xtreme 4 Portable Waterproof Speaker delivers next-level massive JBL Pro Sound with amazing dynamics. Equipped with two powerful woofers and two tweeters it offers deeper bass that moves you. Features include up to 24 hours of playtime (plus 6 hours with Playtime Boost) a convenient shoulder strap AI Sound Boost for optimized performance IP67 waterproof and dustproof rating multi-speaker connection via Auracast a built-in power bank replaceable battery fast charging JBL Portable app support and eco-friendly materials.