DOOR GUARD

      The unit consistes of a sensor fixed to the main door and a battery operated electronic timer & alarm unit housed in a sturdy, tamperproff ms box fixed on the door. The unit is provided with a key operated master switch . When the unit is switched on with master key it comes into guard position after a preprogramed time delay. After this if the door is opened a signal is given to the alarm circuit, which sounds the alarm after a preprogramed delay (day mode) or immediately. (night mode) . The alarm can be switched off by the masterkey. The alarm is loud enough to be heard in the vicinity. Day & night mode. Can be selected by a switch. Number of sensors can be connected to one unit, so that the same unit is useful for numer of doors. the unit is extremely useful in shops, bunglows, flats, and offices.