Linear of Carlsbad, Calif., is offering the TRANS PROX line, which includes the ACT-34DH four-channel factory block coded key ring transmitter and 26-bit HID-compatible proximity tag. The product's 26-bit Wiegand prox tag is programmed to the same block code as the transmitter. The transmitter uses MegaCode format, so it is factory preprogrammed with one of more than 1 million codes, virtually eliminating the possibility of duplication. Because the receiver ‘learns' each specific code, no unauthorized person can gain access to the system by reprogramming a transmitter. linearcorp.com