JBL Charge 3. Waterproof Portable Bluetooth Speaker (Black) Bluetooth - Wirelessly connect up to 3 smartphones or tablets to the speaker and take turns playing powerful stereo sound. Battery type : Lithium-ion Polymer (22.2Wh)2) 20 hours of playtime(varies by volume level and content) 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.