Jbl Xtreme 4 builds on the Xtreme family with an even bigger battery, a refined acoustic tuning, and signature deep bass. IP67 waterproof and dustproof chassis takes on pool, park, and trail, while 24 hours of playtime, a swappable battery system, and a built-in powerbank keep your music and phone going. PartyBoost multi-speaker pairing scales up the sound whenever you need it.