The 433CTG has been designed for programmable telephone entry systems, anti-burglar systems and access control systems. It has very high security coding system (KeeLoq Hopping Code). The code sent by the transmitter will change for each activation; avoiding any scanning and copying risk. A special algorithm keeps the transmitter and receiver synchronized. The operating frequency is 433.92 MHz . The receiver, RCS-433R, which operates with this transmitter, has a Wiegand 26 bit format output, suitable with any type of access control system, equipped with this type of protocol.