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1850-1990MHz
It's a photodetector-based optical sensor that detects the absorbance of pulsing blood after emitting two wavelengths of light from two LEDs - one red and one infrared
The printed colour code rings
Part Number 1N5399 Peak Reverse Voltage 1000V AC Maximum RMS Voltage 700V AC Average Rectified Current 1
It has a 16 MHz crystal
5mm Red/Green Bi-Colour (Common Cathode) 3 Pin LED White Diffused Lens 220E 1850-1990MHzA small Red and Green bi color 5mm light emitting diode with a common cathode that produces consistent light and consumes little power, contained in a milky white packaging. It is suitable for PCB or panel mounting. In a shared cathode design, diodes are linked. The common cathode is the centre leg, and it is the place where a resistor should be installed for the protection of the LED. Pin Configuration Pin Name Description Anode The positive terminal