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Amazon.com: Gikfun 5mm 940nm LEDs Infrared Emitter and IR Receiver Diode for Arduino (Pack of 20pcs) EK8443 : Industrial & Scientific
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Uxcell 30 Pack 5mm 940nm Infrared Receiver Diode DC1.2-1.3V LED IR Receiver Light Emitting Diodes Black Round Head - Walmart.com
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