NFL Washington Redskins Shock Wave Personal Audio Speaker Be The Biggest Fan With Three Hours Of Music On A Single Battery Charge With Internal Battery, Perfect for Tailgating Events, Home or Office. Connects to Your Mobile Phone, MP3 Player or Laptop (cables included). Vibration Technology Turns Any Hard Surface into A Large Speaker. Able to "daisy-chain" multiple speakers together. Small size (2.5" x 2.5" x 2.5") with big sound. Connects to Your Mobile Phone, MP3 Player or Laptop Vibration Technology Turns Any Hard Surface into A Large Speaker Perfect for Tailgating Events, Home or Office Features Full Color Graphics