Rocksteady Portable XS V1.5 Wireless Bluetooth Speaker - Matte Black Loud and Clear - The loudest and clearest portable speaker in its class. No speaker available under $200 can match its sound, performance, or durability. And no speaker under $200 can match its value. 10 hours per charge - Micro-USB charging port, so there is no need to carry around heavy charging plugs and proprietary cables. 10 hours of playback per charge, and expandable to forever thanks to the ability to replace your battery on the fly. Easy connection - Guaranteed to connect to your Smartphone or Tablet. Or connect using the supplied 3.5mm cable from your device's headphone jack. Also featuring a USB Port for MP3 Playback directly from a USB Drive. 2.1 Stereo Surround Sound: Side facing speakers and a Subwoofer makes the Rock steady XS the only portable Bluetooth speaker to deliver a true Stereo Surround sound. Party Mode - Connect two devices at the same time. Play one track from one phone then switch to the other phone on the fly.