'1/4'' telephone jack with locking latch, black metal housing and silver contacts. The panel mount version of the 3-pole telephone jack provides stable and secure connections where accidental disconnection or shock and vibration may occur. Plugs into standard A-gauge mono or stereo plugs. The plug automatically locks upon docking and is only unlocked by pressing the red release tab. Standard D size appearance on the front panel. Selectable grounding options.'