Despite its low price, the HiFiMAN HM-101 boasts impressive specifications such as S/N ratio of 96dB, 0.07% THD and stereo crosstalk of 78dB. Yet it does it in a compact package less than 2 ½" long by 1 ½" wide and ½" thick. Connections are simple with USB input and standard mini output for use with portable audio devices.Specifications Frequency Response: 20 to 20k HzTHD: 0.07%S/N: 96 dBStereo Crosstalk: 78 dBHeadphone Amplifier Output:62 mw at 36 Ohm26 mw at 150 OhmDimension: 36 * 60.5 * 13.8 mm