With the Parrot Digital Messaging Switch Plate you can record a message that will be heard by you or your loved ones whenever a light switch is turned on or off. The Parrot Digital Messaging Switch Plate is easy to install- no wiring involved! You simply remove an existing switch cover plate and put the Parrot in its place. The light switch knob fits through a hole in the unit and whenever the light switch is turned off or on it will play your prerecorded message. You can set the unit to lock in your message or to change it with a simple touch of a button. Messages can be up to 20 seconds long. Great for every room in the house. In the kitchen you could record a message to yourself like: "Don't be tempted to open the refrigerator, remember you're on a diet". In the living room you could record a message to the kids like: "Don't forget to finish your homework before watching TV". So simple to use even children can do it. Mounts with two screws (included). Requires 4 "AAA" batteries (not included) which will last about two years. Quantities are limited.