蜂鳴器 - is backordered and will ship as soon as it is back in stock.
蜂鳴器模塊播放4kHz音調。蜂鳴器電路的音量可以通過改變通過它的功率來調節。加號和減號指示蜂鳴器電路模塊的操作方向。
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