to unlock a controlled door include presenting an electronic access card or keyfob, entering a numeric or alphanumeric code, presenting a biometric attribute such as thumbprint or facial scan, or a combination of any of the above. 

An access system controller evaluates the data from the presented medium and checks it against a database of information and rules.  The database and rules include lists of authorized people, access restrictions by days of the week and hours of the day, which doors and areas employees and other persons are allowed access to, etc. If the submitted information matches the database, the controller unlocks the door allowing the person entry access.

Covan offers the latest in state-of-the-art access control systems, card and code entry, biometric, and telephone. We've got all your day-to-day access control concerns covered. Let us help make your business more secure by controlling access to key areas and doors.