The SMSL M3 is a all in one DAC/Amp with USB, optical, and coaxial inputs. It comes with a CS4398 DAC chip and can be powered by a computer. The LED indicators on the front panel indicate the input mode and the full frequency sampling rate can be found on the front panel. Finally, the M3 is a solid construction with a high quality aluminum alloy shell and solid aluminum buttons/knobs.Specs: DAC chip: CS4398 Channels: 2 Output power level: 1.9 Vrms THD+N: < 0.006% Dynamic range: > 112 dB SNR: > 107 dB Channel separation: > 105 dB Sample rate, USB: 96 kHz (24 bit) Sample rate, optical and coaxial: 192 kHz (24 bit) Output power, 108 mw: 32 ohm at THD 0.1% Output power, 85 mW: 64 ohm at THD 0.1% Output power, 49 mW: 150 ohm at THD 0.001% Output power, 24 mW: 300 ohm at THD 0.001% Inputs: USB, optical, coaxial Outputs: Line, headphone amp Size: 9.5 x 7.6 x 3 cm Weight: 212 g Included Micro-USB to Micro-USB cable Micro-USB to Micro-B cable 3.5 mm to ¼ in gold-plated adapter