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FOUR Advisor 851 Microprocessor Infrared Motion Sensors - $20 (Cartersville)
condition:
good
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These came out of a Government facility so I'm assuming they work fine but I have no way of testing them so they are sold as is. Two of the units look as if they may actually be new but I'm listing them all as 'used'. The manual is included.
Each unit measures about 7 1/2 x 7 1/2 x 6