The Keystone pattern controller is a 24VDC, 4 event timer that can fire up to 2 solenoids simultaneously using 1 photo eye. Very simple to use programming directions are located on the front plate. .  ON THE FLY ADJUST 1 AMP OUTPUT TO SOLENOID 9 STORED PROGRAMS 4 EVENT TIMER: DELAY-GLUE-DELAY-GLUE ECONOMY MODE-ONE BUTTON ACTIVATION- STITCH PATTERN SEALED BUTTONS 24 VOLT ONE SOLENOID, ONE PHOTO EYE 120V AND 240V POWER FOR THE SUPPLY CAN FIRE TWO SOLENOIDS SIMULTANEOUSLY IF USING ONE PHOTO EYE CAN USE EITHER NPN OR PNP PHOTO EYES