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.
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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