NIER iRock Mini Portable Wireless Bluetooth Speaker, 15Watt powerful sound, Pure Aluminum Housing, bluetooth 4.0 Technology (Black) Equipped with the latest v.4.0+NFC Bluetooth technology, built-in HQ MIC allows high quality handsfree calling The rechargeable, high capacity 2200 mAh battery enable an extended playing time up to 8 hours. With two powerful 7.5 Watt horns, total 15W high power brings Clear and Powerful sound quality after well tune. A2DP wireless audio transmission protocol to support More stable and compatible Bluetooth connection Support external audio AUX input