如今,几乎家家都有门铃,通常这些门铃只能发声,如果是聋人使用就十分不便。我想发明一种能让聋人看见的门铃,其实方法很简单,在普通门铃上加两个发光二极管,当客人按铃时,门铃既发声又发光,残疾人、正常人都可使用,我把它叫助残门铃。 Nowadays, almost every family has a doorbell. Usually these doorbells can only sound, and it is very inconvenient for them to use it. I want to invent a doorbell that the deaf can see. In fact, the method is very simple. Add two LEDs to the ordinary doorbell. When the guest rings the bell, the doorbell sounds and glows. The disabled and normal people can use it. Call it disabled bell.