Infrared Emitter (IR LED or IR Diode, 5.8mm, 2.3V, colourless non diffused, 830nm) | Engineering Stores
uxcell 10pcs 5mm 940nm Infrared Emitter Diode DC 1.35V LED IR Emitter Light Emitting Diodes Clear Blue Round Head TSAL6200: Amazon.com: Industrial & Scientific
Gikfun 5mm 940nm LEDs Infrared Emitter and IR Receiver Diode for Ardui
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3mm IR LED Emitting Diode DIP 850nm 940nm Emitter Receiver Infrared Transmitter | eBay