SYBA SD-DAC63094 USB 2.0 DAC 24 bit 96KHz and Headphone Amp with 3 Present EQ Color: Other Specifications: USB 24-bit / 96KHz DAC S/PDIF Digital Output - AC3 (Dolby Digital) / DTS Pass-Through Dynamic Range Around 91dB OPAMP Power Supply: 2.75V USB Powered Analog Out: Stereo Headphone Output and Stereo Line-out 3.5mm Digital Output: S/PDIF Switch: Bass Boost, Direct, Treble Boost Interface: USB A Male Interface (1.1 / 2.0 compatible) Integrated De-Pop Function For Suppress Pop Noise During PC Power-Up and Shutdown. Maximum Headphone Output Power: Around 120mW / 16ohm; Around 60mW / 32ohm at 1KHz Recommended Headphone Impedance: 16-100 ohm Supports Apple Headphones with Microphone Dimensions: L 6.75 x W 3.8 x H 1.5 Weight: 0.5lbs Package Contents: 1 x USB Audio DAC with EQ 1 x User Manual 1 x Software CD