5 x Racal Guardall Pegasus 30 long range ceiling PIR for wired alarm system
these were the top of the range PIRs when they were produced they were the best PIRs available. the size is about 140 x 140 x 80mm the power required is 10.5 to 15V dc it has a normally closed contact and anti-tamper connections for connecting to an alarm panel.
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