The present invention provides a security device for attachment to an electrical cord. The device includes a housing assembly having an exterior housing and an interior housing. The interior housing having means to securely attach the plug inside the interior housing. The device also includes an exterior housing for inwardly receiving the interior housing and the attached plug. The interior housing snap locks into the exterior housing to provide a locking non-removable engagement therewith. Additionally, the housing has means to provide a tight engagement of the plug with the housing assembly.