Cambridge Audio DacMagic XS Portable USB DAC Amp - Black Instant upgrade to any computers sound output. Total weight of just 3.5 ounces. Award winning. Just plug into the USB connection of your computer or Mac for incredible, detailed high resolution audio. Up to 10 times more power than most laptop soundcards. Compared to most laptops' 15-20mW output with weak bass and a lack of depth, the DacMagic XS can output a massive 105mW for proper depth and volume that will drive the very best headphone set ups hard, with detailed sound and amazing bass. Bypass computers poor audio path, preventing unwanted interference and re-sampling and guaranteeing professional quality audio output. 2-year warranty if sold from an authorized retailer Signal To Noise Ratio : 103 dBr (unweighted) Crosstalk @ 1KHZ: 66dB Output Impedance : 0.5 Ohms Volume Steps : 53 steps (54 different volume levels) Dimensions (WXHXD): 1.2 x 0.4 x 2.1 (30 x 10 x 53.5mm) Weight : 3.5oz (100g) Connections: Micro USB input, 3.5mm analogue output Digital To Analogue Converter : ESS9023 24-bit DAC Sample Rates Supported : USB 1.0 mode: 16/24-bit, 44.1kHz, 48kHz, 88.2kHz, 96kHz USB 2.0 mode: 16/24-bit, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz Output Voltage : 2V RMS Max. Power Consumption : 150mW Min. Headphone Impedance : 12 Ohms Frequency Response:  +/-0.2dB 20Hz  20kHz