INTRUDER ALARM :- INTERRUPTION TYPE

      The unit consists of a infrared light source and infrared Receiver unit. The two units are positioned in a straight line Such that the light falls directly on the receiver unit. When The light is interrupted momentarily the unit triggers an Alarm. Visual indication can also be provided. A light can also Be switched on for a predetermined time. these units are extremely useful in hotels, shops, banks, Bunglows, flats etc. These units could be operated on a battery.