The wall mounted Change-Matic multi-key lockbox allows the user to have a key operated lockbox that can easily be changed to operate from a different key. This can be done, while in the field, in less than one minute. Each lockbox is originally designed to be opened by seven different key combinations. Only one of the seven keys can actually open the lockbox. To determine which one of the seven keys opens the lock box is actuated with a special change key. We suggest a minimum of two different operating keys and the change key for your initial order. The five remaining change key combinations can be ordered at any time to fit your needs. All orders for wall mounted Change-Matic multi-key lockboxes must be placed by phone (800-508-6889).