当按一下按钮，门铃触发奏完一曲后即自动切断交流电源，不会误触发。可用来取代现有的电子音乐门铃。
When its button is pressed once, the bell is triggered to play a music and then AC power supply is automatically cut off without error triggering.
切断交流电源才能维修、清洗磁头、压轮等部件。
Remove the AC supply lead before servicing or cleaning heads, rollers etc.
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