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PCsensor Photoelectric Sensor Switch Diffuse Reflective HID USB User Defined Keyboard Infrared Sensor Proximity Switch Automatic Sensory Device for Scanner Printer Copier: Amazon.com: Tools & Home Improvement
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Adafruit Proximity Trinkey - USB APDS9960 Sensor Dev Board : ID 5022 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Reflective Photoelectric Switch Infrared Sensor User-defined USB Keystroke Simulator USB Keyboard Proximity Switch
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