USED AS A LIGHT OPERATED TIMING GATE ,IT CONSISTS OF A PHOTO DETECTOR AND LIGHT SOURCE ( 2.5 V , 0.2 A BULB ) HOUSED IN TWO PLASTIC CASES HELD 40 MM A PART ON A METAL ROD ,4 MM SOCKET ARE PROVIDED FOR CONNECTING IT TO THE ELECTRONIC TIMER.
POWER SUPPLY :- 2 V/ AC.
