Ultrasone New performance Series: 840, 860 & 880 (First post last update : 2014/12/07) | Headphone Reviews and Discussion - Head-Fi.org
Amazon.com: Ultrasone Performance 880 Headphones. Professional Closed-Back Audio Accessory for Music and Studio. S Logic Plus Technology. with Neoprene Case. : Electronics
The Best Bluetooth Audio I've Heard! : Ultrasone Performance 880 - YouTube
Ultrasone 880 and 840
Ultrasone Performance 880
Used Ultrasone Performance 880 Closed-Back Headphones with In-Line Mic - SKU#1491690 UL 19003