Concerning this item With deep bass, nothing compares to the incredible JBL Original Pro Sound. Fun ring lights and a cool strobe effect that syncs to your music are features of the dynamic light show. No plug. No issue. With up to six hours of playback, the JBL PartyBox Encore Essential keeps the party going wherever you are. dancing on the shore. Have a party by the pool. You can never be concerned about the party getting too wild or wet because the JBL PartyBox Encore Essential is IPX4 splash proof. A single JBL PartyBox is insufficient. True Wireless Stereo (TWS) technology allows you to wirelessly pair two speakers for a louder, more expansive sound.