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WIRELESS BLUETOOTH STREAMING Wirelessly connect up to 2 smartphones or tablets to the speaker and take turns enjoying powerful sound.. UP TO 20 HOURS OF PLAYTIME Built-in rechargeable Li-ion 7500mAH battery supports up to 20 hours of playtime and charges your device via USB port. IPX7 WATERPROOF Take Charge 4 to the beach or the pool without worrying about spills or even submersion in water. JBLCONNECT plus Amplify your listening experience to epic levels and rock the party perfectly by wirelessly connecting more than 100 JBL Connect plus enabled speakers.. DURABLE FABRIC AND RUGGED MATERIAL The durable fabric material and rugged rubber housing allows your speaker to outlast all of your adventures. JBLBASS RADIATOR Dual passive radiators deliver powerful, ear catching JBL sound that resonates loud and clear.. INCLUDED JBL Charge 4 speaker, USB-C cable, Quick Start Guide. PLEASE NOTE The Charge 4 does not come with a USB wall, power adaptor.