Venstar Waterproof Wireless Bluetooth 4.0 Speaker, Aluminum Portable Stereo Speaker, 1800mAH Battery Built-in Mic 2x5W Shockproof High-Def Sound - Black Aluminum Case Elegant Design: High-end aluminum cutting-edge alloy shell casing assures a sleek look and durable configuration. Dual Drivers Stereo Speakers: 2 stereo speakers (2*5W) drivers deliver superior bass performance for those low tones that help ensure rich, high-quality surround sound and surprising fullness. High Capacity Battery: built-in powerful 1800mAh lithium rechargeable battery allows for 15 long hours of wireless play (depends on the paly volume). Free of dead battery worries for outdoor use. Powered by Bluetooth 4.0 technology with up to 33 feet bluetooth signal, enjoy music on the go. Built-in high sensitivity microphone ensures clear hand-free speaker phone calls. Compact Size, Premium Sound: Compact with clear and crisp sound. Handheld size allows put into pocket, an ideal hand hold speaker when strolling, outdoor.