Upbeat Audio LLC R234-2 Boostaroo Revolution Amplifier for iPod (Black) Works With All Ipods Battery Operated Pocket Amp & Splitter That Makes Compressed Digital Audio For Surround Sound 4 Times The Volume Designed For High-End Headphones 60? & 300? 2-Way Splitter For Sharing With 2 Headphones Or Computer Speakers Versatile Use With All Portable Electronics Mp3, Cd, Dvd, Video Games, Laptop, Tv & Satellite Radio