Access control systems allow access or egress to all forms of premises. These include offices, apartments, schools etc. where controlled secure access is required. The security level required will determine the type and operation of the system to be installed. Standalone devices only require a power supply and locking device, the control circuitry and “door open” relays (one or more depending on the model) are housed within the access control module. The user provides either an access code, proximity key fob or fingerprint, and if the data presented is correct, the relevant relay will be enabled and access granted.