The 3 pole phone cable jack in-line version provides stable and secure connections where accidental disconnect or shock and vibration may occur. It latches with standard A-gauge mono or stereo plugs. Plug locks-in automatically when mating and unlocks only by pressing red release tab. The Neutrik NJ3FC6-B is a professional locking 1/4" cable jack for secure in-line connections. It features a black metal housing, silver contacts and provides excellent cable protection.