"CONTROLLER WITH TRIP OUTPUT; RATED NEMA 13; FORCED-GUIDED CONTACT RELAYS 250V AC MAX, 4A MAX (RESISTIVE LOAD) OUTPUT CONFIGURATION; HAS EXACT AND 1-BEAM FLOATING BLANKING CAPABILITY; CREATES A CURTAIN OF SYNCHRONIZED, MODULATED INFRARED SESNING BEAMS FROM 6 INCHES TO 6 FEET HIGH; IS HIGHLY IMMUNE TO EMI, RFI, AMBIENT LIGHT AND STROBE LIGHT; EPOXY-ENCAPSULATED, VIBRATION-TOLERANT, FACTORY BURNED-IN EMITTER AND RECEIVER CIRCUITRY FOR TOUGHNESS AND DEPENDABILITY"