Massive JBL Pro Sound on a whole new level: Dual pumping, two woofers, and two strong drivers With more bass and lots of detail, JBL Bass Radiators produce dynamic, engrossing sound with ease. No matter where you are, you will lose yourself in the music. Take the JBL Xtreme 4 with you wherever you go, both indoors and out, and enjoy 24 hours of playback plus an additional 6 hours with Playtime Boost. Before you need a break, you can listen to your music all day. To extend your battery life by up to six hours, tap Playtime Boost. Convenient shoulder strap: Depending on your preference or mood, you can wear the speaker crossbody or on your shoulder. AI Sound Boost: This technology employs an AI algorithm to evaluate the incoming signal and