JBL Charge 3 Waterproof Portable Bluetooth Speaker (Gray) Bluetooth - Wirelessly connect up to 3 smartphones or tablets to the speaker and take turns playing powerful stereo sound. Built-in rechargeable Li-ion battery supports up to 20 hours of playtime and charges smartphones and tablets via USB. IPX7 Waterproof Take crystal clear calls from your speaker with the touch of a button thanks to the noise and echo-cancelling speakerphone. Build your own ecosystem by connecting multiple JBL Connect enabled speakers together to amplify the listening experience.