Electrifying sound with AI Sound Boost: Powerful sound to make your playlist shine. This sound is made to match your energy, so you feel like you're hearing each song performed live. Turn it up louder and your music will still sound great, as our new proprietary tech, AI Sound Boost analyzes your music in realtime to deliver maximum acoustic performance with less distortion. Futuristic lightshow: Did someone say lightshow? Dance the night away with glowing light patterns and strobe effects that make any event a whole mood. Up to 15 hours of play time: Keep the good vibes going on a single charge with up to 15 hours play time. And if 15 hours of nonstop jams isn?t enough, wimplay swap out the replaceable battery to keep the music going. Or charge for 10 minutes and get an extra 2 hours of play time. *Replaceable battery sold separately Multi-speaker connection by Auracast: Bigger parties call for even bigger sound. Pair two PartyBox 520s for true stereo vibes via Auracast, or connect multiple JBL Auracast-enabled speakers wirelessly and let your music grow with your party size. Control your party, right from the JBL PartyBox app: Don't feel stuck on speaker babysitting duty. Control your music, EQ settings, and lightshow from the JBL PartyBox app, wherever the party takes you. Telescopic handle and wide sturdy wheels: Wherever you go the JBL PartyBox 520 is ready for action with a handle that can extend and rolly wheels for a smooth ride. IPX4 Splash proof: Spills and splashes happen?don't sweat the mess. The JBL PartyBox 520 is IPX4 splash proof so your flow is never interrupted.