nano iDSD Black Label by iFi audio - Portable DAC and Heaphone Amplifier
iFi Audio micro iDSD Black Label Desktop/portable USB DAC/preamp/headphone amplifier at Crutchfield
iFi iDSD Black Label: Swiss Army knife utility, top tier sound and flexibility that does everything extremely well, so much value it's just unfair to the competition – Audio Primate
Review of iFi iDSD BL | The Headphone List
iFi Nano iDSD Black Label Review - Headfonia Audiophile Reviews
iFi nano iDSD Black Label Portable Headphone AMP/DAC