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CommentStreams:Be18c8041ef41b66ecbc5ecca0b6cc5f

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Hello，

①Please refer to FAQ information：[Raspberry Pi Tutorial: How to Use a Buzzer]

②AC FALL(AC Power Loss LED)----When AC power supply is not connected or power supply fails, the red indicator light is always on. If connected to AC power, the red indicator will not light up.

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