"CONSISTS OF FRAME HOLDING PRINTED WIRING BOARD WITH CONNECTOR,ELECTRICAL,RECEPTACLE; TWO CAPACITORS,FIXED,ELECTROLYTIC; ONE CAPACITOR,FIXED,CERAMIC DIELECTRIC; TWO MICROCIRCUITS,DIGITAL; TWO KEYING PINS,ONE WITH 90 DEG CUTOUT ON LOWER LEFT OF PIN,ONE D-SHAPED WITH FLAT SIDE TIPPED 45 DEGS TO THE RIGHT FROM VERTICAL; PROGRAMMED BY TRUTH TABLE 77A102042"