This is the Locking Plates accessory for the Nightingale White Noise System by Cambridge Sound Management.
These locking plates are installed in place of the regular outlet covers. They replace the outlet cover, and the Nightingale unit snaps into the plate as it is plugged in. The locking plates make it difficult for a thief to remove the Nightingale from an outlet when installed in a waiting room, hallway or other quasi public location. Two plate styles are available to choose from: Standard and Decora.
Includes pack of two locking plates and removal tool.