Add the magic of tubes to the sound of your music Plug the HiFiMAN EF2A into one of your computer"s USB ports and prepare to be impressed. This compact digital-to-analog converter/headphone amp bypasses your computer"s built-in DAC and audio circuitry - processing your digital music files outside the noisy environment of your computer for far better sound quality. The EF2A"s vacuum tube headphone amplifier brings your tunes to life, imparting smoothness and clarity. You"ll hear more dynamics and detail that you can really savor on your headphones. The EF2A also includes an analog audio input so you can enjoy improvements in sound with another music source. This is one component that looks so cool, you"ll absolutely want to show it off on your desktop.