Divoom Voombox Ongo Rugged Portable Bluetooth 4.0 Wireless stereo speaker for Smartphones, Tablet PC and more (Black) Portable rugged Advance Bluetooth 4.0 Speaker System that consumes less energy and provides crystal clear sound Connects to any Bluetooth-enabled device,such as your Smartphone, tablet,or laptop Provides Water resistant and speakerphone function. Built in screw thread to attach an bike mount (included) Equipped with a passive subwoofer and two 1.5" drivers and delivers rich bass sound Built in rechargeable with up to 8 hours playing time