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Power supply: 2-5.5VDC, green LED, lights up when powered on correctly.
Touch area: Both the front and back can serve touch surfaces, replacing traditional light touch buttons.
Similar to the internal area of a fingerprint icon, it can be triggered by lightly touching with a finger.
Control interface: There are a total of 3 pins (GND, VCC, SIG), with GND as the ground, VCC as the power supply, and SIG as the digital signal output
