Rosslare's AYC-F54 is part of the Convertible line of readers / controllers, this unit can be operated as an outdoor backlit keypad reader, which connects to any standard controller, or else it converts into a fully featured, 500-users stand-alone controller when connected to Rosslare's PS-x5 family of intelligent power supply/relay units. This unit provides a most effective solution for indoor and outdoor access systems where PIN credentials are required.