Amazon.com: iFi Nano iDSD Black Label Portable USB DAC and Headphone Amplifier with MQA and DSD. Use with Smartphones/Digital Audio Players/Tablets/Laptops (Includes iFi Audio OTG Cable USB Micro) : Electronics
iDSD Micro Black Label: "Good DAC with Multi-connect and output." A review by stevenyu2000. - iFi audio
iFi audio Micro iPhono3 Black Label Phono Amplifier 303016 B&H
Amazon.com: iFi Nano iDSD Black Label Portable USB DAC and Headphone Amplifier - Upgrade Smartphones/Digital Audio Players/Tablets/Laptops : Electronics
iFi Audio micro iDSD Black Label: Sound Quality First!" a review by earfonia on Head-Fi. - iFi audio
iFi Micro iDSD Black Label Portable DAC with Headphone Amplifier Now Available - ThePCEnthusiast
Trans/portable high-end audio: iFi's micro iDSD Black Label | Darko.Audio