Biometric access control works by verifying the user as authorised or not on the basis of biometric authentication using their physical uniqueness. Biometric readers come in a variety of forms but the most common are fingerprint and facial recognition. Standalone biometric access control is usually one or two small units wired at the door to control access. There is no need for a PC network and you don’t have to secure every single door within your building, only those you wish to individually. User authorization can be added to the system in seconds at the door.