Additional FeaturesWireless Bluetooth Streaming- Wirelessly connect up to 2 smartphones or tablets to the speaker and take turns enjoying powerful sound.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.JBL Connect+- Amplify your listening experience to epic levels and rock the party perfectly by wirelessly connecting more than 100 JBL Connect+ enabled speakers.Durable fabric and rugged material- The durable fabric material and rugged rubber housing allows your speaker to outlast all of your adventures.JBL Bass Radiator- Dual passive radiators deliver powerful, ear catching JBL sound that resonates loud and clear