Mpow Cannon Portable Bluetooth 4.0 Stereo Speaker with Built-in Mic for Hands-free Calling and Enhanced Super Bass, Aluminum Alloy Material Durability, unique design and born noble temperament due to high grade aluminum alloy material. Latest Bluetooth 4.0 Technology. Connect your devices in 3 second. Connection range is up to 33 feet, enables you to enjoy the sound without wires. 3.5mm audio jack for non-Bluetooth devices. Built-In Mic Hands-Free Speakerphone: pick up a call conveniently by this mini speaker anywhere when it is connected to your Smartphone. Up to 8 hours playtime powered by an internal long-lasting rechargeable lithium battery makes you freely enjoy crystal clear, powerful sound. Small size(1.6 x 2inch) but big clear sound, Make your ears free of earphones and best for music lovers.