https://en.audiofanzine.com/hifi-audiophile-headphone/ultrasone/edition-m/news/a.play,n.20906.html
Ultrasone Edition M closed-back headphones for mobile - Audiofanzine
Jul 17, 2015 - Ultrasone is about to launch a new version of their Edition Series headphones which is designed for use with a smartphone.
ultrasone edition mclosed back headphonesfor mobile