It's an electronic system restricting access (i.e. entry into and/or exit from a security controlled area). You can as well set the criteria for the people that are allowed to access the building, or sensitive areas within the building.
-Largest Scale Network Access control system (Providing access like Day, Time, Visitor Category & Ect)
-Induvial door access
Radio-frequency identification (RFID) uses electromagnetic fields to automatically identify and track tags attached to objects. The tags contain electronically stored information and Key pad reader read the details from Access control list