Door Entry opening sensors

Door contact switch entry alarms employ a magnetic, electronic or mechanical type switch mounted to the door and door frame that senses when the door is opened and sends an alert to a wireless receiver and/or remote announcer or chime mounted to the door or door frame. These devices work on an entry or exit door (one specific door) opening versus movement or motion in an area which might be too big and cause a false alert or chime. This type of entry alert is great for your business, office, retail store or commercial location where visitors and customers come right in without knocking.