Telescopic Handle and Built-In Smooth-Glide Wheels, IPX4 Splashproof Protection, Built-In Karaoke Mode, 18 Hours of Music-Blasting Battery Life, Powerful JBL Pro Sound. display attribute: ce display on website model number: JBLPARTYBOX310 batteries required: FALSE The party doesn't stop when the sun goes down. The control panel on JBL PartyBox 310 has convenient built-in backlighting that activates in the dark. You'll be able to keep the tunes going, with no need for a flashlight.JBL PartyBox 310 Portable Party Speaker with Dazzling Lights and Powerful JBL Pro Sound, 18H Battery, Built-In Wheels, IPX4 Splashproof, SOund Effects, Karaoke Mode, USB Port. Huge sound, dazzling lights and unbelievable power set this speaker apart from the crowd. The JBL PartyBox 310 packs a full party into a transportable, splashproof sound machine like no other. Turn up your favorite playlists anywhere, from get-togethers at home to dance parties on the beach.