Geek Out: Portable USB DAC & 1000mW Headphone Amplifier The first and only 32-bit / 384kHz + DSD 128 portable USB Digital-to-Analog Converter: that means you can hear music louder and clearer. On-the-go, high-res DAC and headphone amp that plugs into your computer's USB port to make your videos, music, & games come to life because the powerful pure Class A amplifier (1,000mW max power output) capable of driving power to any headphone, even the most esoteric audiophile brands. USB 2.0 compatibility allows for use with virtually any computer - Windows or Mac. Features an audiophile grade Digital-to-Analog converter that connects directly to your headphones Geek Out 1000 offers 1 full watt of pure Class A power and provides you audiophile quality at minimal cost and maximum convenience