Listen to crystal clear audio and heavy bass for a dynamic sound effect. Bluetooth offers wireless audio streaming. IPX7 Rated waterproof Sandproof and more. Speaker floats while in use so you can take it to the pool beach and anywhere else. Control music playback directly from speaker. Built-in 1500mAh lithium rechargeable battery. Carabiner hook for easy portability. Built-in microphone for hands-free calls. Battery talk time up to 20 hours. 2" Driver. Frequency response: 100Hz - 18kHz. Impedance: 4 ohms. Includes Micro USB charging cable.