iFi nano iDSD Black Label Portable Headphone AMP/DAC
iFi Audio micro iDSD BL DAC and headphone amp
iFi iDSD BL DAC + Headphone Amp Review: Black is Better - The Sound Apprentice
iFi Audio Nano iDSD Black Label Portable DAC/Amp | HeadAmp
micro iDSD Black Label by iFi audio - USB DAC and Headphone Amp for Home and Portable
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