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The HRT microStreamer is a compact, portable, USB-powered external sound card and headphone amplifier designed to dramatically improve the audio quality of your computer, tablet, or smartphone. Awarded What HiFi? 2013, it delivers jitter-free, high-resolution playback up to 24-bit/96kHz without the need for additional drivers. Key Features Ultra high-performance external sound card with USB connectivity and power High-quality headphone amplifier with analog volume control Fixed-level, low impedance 2.25V line output for home stereo or powered speakers Compact aluminium enclosure, precision-machined from solid billets Asynchronous USB operation eliminates timing errors (jitter) Plug and play with native Audio Class 1.0 drivers (PC, Mac & Linux) Supports sample rates of 32k, 44.1k, 48k, 88.2k & 96kHz Digitally controlled analog attenuator for pure, clean headphone volume control LED indicators display current sample rate and mute status Firmware upgrades via HRT UpStream utility Designed and manufactured in Southern California Specifications Input Connector: USB powered and connected Output Connectors: 1/8” (3.5 mm) stereo male plug (line level and headphone) Full Scale Output: 2.25 V RMS (line), 1.4 V (headphone) Output Impedance: 50 Ohm (line), 0.5 Ohm (headphone) Frequency Response (20 Hz–20 kHz): +0 dB / -0.4 dB Output Power: Up to 140 mW (headphone) Noise Floor (DC to 30 kHz): 18 µV RMS Signal-to-Noise Ratio (DC to 30 kHz): 102 dB Signal-to-Noise Ratio (A-weighted): 105 dB THD+N (1 kHz Full Scale): 0.002% (line), 0.008% (headphone) THD+N (1 kHz -20 dB): 0.0006% (line) Jitter Contribution (DC to 30 kHz): >130 dB below full scale Attenuator Range: Line fixed, 63 steps (headphone) Sample Rate: Up to 96 kHz Bit Depth: Up to 24 bit USB Transfer Protocol: Asynchronous Power Requirements (USB Bus): 150 mA Dimensions: 2.5" x 1.2" x 0.4" What's in the Box HRT microStreamer USB cable User manual