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This KY-039 Finger Detection Heartbeat Measuring Sensor Module uses bright infrared (IR) LED and a phototransistor to detect the pulse of the finger
or its compatible RFID
The light produced by the LED activates the light sensitive properties of the diac and the power is switched on
and chip erase
12v 9a Dc Battery Circuit Breaker This KY-039 Finger Detection HeartbeatThis 12V DC 9A Battery Sealed Lead Acid (SLA) battery provides long lasting and reliable power for your projects, gadgets, or security systems. This rechargeable battery ensures sustainable use and eliminates the need for constant replacements . This battery is design to provide reliable power for a variety of applications. With a voltage of 12V and a current of 9A. It is suitablefor use in vehicles and boats. The battery is built to last and is a
