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HC-SR505 Mini PIR Motion Sensor
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![HC-SR505 Mini PIR Motion Sensor [HC-SR505] - US $2.20 : HAOYU Electronics : Make Engineers Job Easier](http://www.haoyuelectronics.com/Attachment/HC-SR505/HC-SR505-2.jpg "HC-SR505 Mini PIR Motion Sensor [HC-SR505] - US $2.20 : HAOYU Electronics : Make Engineers Job Easier")