SoundBot SB525 Bluetooth 4.0 Wireless Speaker for 15 hrs Music Streaming&Hands-Free Calling,7W+7W Driver Speakerphone,Built-in Mic,3.5mm Audio Port, 4000mAh Lithium-ion Rechargeable Battery EXHILARATING - High performance enhanced bass membranes & passive sub woofer on both ends with 7W + 7W HD loud speakers & premium drivers for both active outdoor and indoor use. LONG LASTING - Built-in 4000mAh high density battery with a handy USB output port that can be used as back up power source to recharge other media devices. 5mm audio line in and 4000mAh rechargeable battery allows SB525 to connect to media devices WITH OR WITHOUT Bluetooth capability. Bluetooth 4.0 audio wireless connectivity with seamless streaming, up to 15 hours of playback time, from 33 feets of distance, reproduces high definition quality sounds seamlessly. Unique and one of a kind stainless steel brush metal finish with potent speaker driver to deliver enhanced music experience. Fashionable and stylish design with solid performance and universal compatibility for Android, iPhone, iPad, tablets, smartphones, iPods, MP3, MP4, radio players, and other Bluetooth enabled digital players or media devices with aux port.