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Keyestudio Pulse Rate Monitor - Black + Yellow
This product uses an ultra-bright infrared (IR) LED and a phototransistor to detect the pulse in your finger. It then flashes a red LED in time with your pulse. The pulse monitor works as follows: Shine the bright LED onto one side of your finger while the phototransistor on the other side of your finger picks up the amount of transmitted light. The resistance of the phototransistor will vary slightly as the blood pulses through your finger.