Adesso Speaker Xtream S2B Portable Bluetooth Speaker Stereo Dual Bass Subwoofer Black (Retail) Bluetooth 3.0 Wireless Technology: Offers up to 30’ feet of Wireless freedom, plus the benefits of lower battery consumption, faster pairing and higher security encryption. Double Bass Subwoofer with (L/R) Stereo: Built-in Double Bass Subwoofer Sound Technology, and Left & Right speakers for high quality stereo sound. Built-in Rechargable Battery with iOS Indicator: Easily charge your device with its built-in rechargeable battery and refer to the iOS battery indicator on your Bluetooth enabled device to show you in real-time how much battery life is available to prevent exhausted battery life. Built-in Microphone: Omni-directional Microphone allows you to make flawless hands-free phone calls |