GLENNEWDICK nailed it.
https://www.wifihifi.ca/LatestNewsHeadlines/Hands-OnReview:AudioQuestDragonFlyBlack1.5/Red.html
I use them on both:
(1) with my desktop PC to bypass the crap sound card output for my desktop stereo, and
(2) in conjunction with the APPLE camera adapter to bypass on the crap APPLE internal DAC on my iPhone for mobile stereo through headphones.
https://www.wifihifi.ca/LatestNewsHeadlines/Hands-OnReview:AudioQuestDragonFlyBlack1.5/Red.html
I use them on both:
(1) with my desktop PC to bypass the crap sound card output for my desktop stereo, and
(2) in conjunction with the APPLE camera adapter to bypass on the crap APPLE internal DAC on my iPhone for mobile stereo through headphones.