Add Control Right On The Cable With The Krk Kns In-Line Volume Control Headphone Cable This Headphone Cable Is Designed Specifically For The Krk Kns6400 And Kns8400 Headphones Featuring A Proprietary Locking Male Connector And Locking Female Connector For Use With The Krk Kns Headphones Control The Volume By Sliding The Volume Control Up And Down With This great Cable