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LED - Infrared 850nm Description: This is a very simple, clear infrared LED. These devices operate between nm and work well for generic IR systems. - ppt download
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5pcs 5mm Infrared IR LED (Set of 5 pieces) Light Bulb Mini Lamp [LEDs] [Wireless] | Lazada Singapore
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100pcs 5mm IR LED 850nm Clear Lens Infrared Diode 20mA Transparent 5 mm Through Hole Light Emitting Diode 850 nm LED Lamp - AliExpress
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batteries - 9V powering to the safest maximum brightness of 4 IR LEDs in series - Electrical Engineering Stack Exchange
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