Abstract: Apparatus is provided for preventing unauthorized use of an electrically operated appliance or device having an electrical cord and attached plug. The preferred embodiment of the apparatus includes a container to receive an electrical cord and attached plug. The container has at least two slots formed in its sidewalls. A cover is provided with a locking means and can be positioned in an open or closed position with respect to the container to allow for deposit or removal of the electrical cord and attached plug. When the plug is positioned in the container, the cover can be closed and locked to prevent unauthorized use of the plug. When the plug is in use, the cord can be received within the two slots with the cover closed and locked to retain the container on the cord during such use.