А вот что по поводу конструкции звонка ответил производитель.Hello,
Sorry for the delay in my response.
Your bell button will not glow if you connect it to the blue connector. It is impossible. There is a voltage required to make it glow but it is no voltage on the blue connector. The blue connector works very simple. It just detects if the both pins of it are connected together ("close") or not ("open"). You can easy check the blue connector using a paper clip (or other piece of wire). Please just put the first end of your clip into the first hole of the blue connector and the second end of the clip into the second hole of the blue connector. It should make your doorbell ring. There will be also an 9V battery required, of course.
I do not know, why your button does not work, You should check it. It should be "closed" when it is pressed and "open" if it is not. That's all. As simple as possible.
You have to know that the doorbell is not powered by the external voltage even it is connected and it always requires a 9V battery to work. As you probably know, an ordinary doorbell start ringing when the bell push is pressed and stop ringing immediately when the push is released. It is because the voltage is only supplied when the bell push is pressed. This is unacceptable for this type of bell because our melodies have to be played to the end even when the power disappears and therefore using the battery is always necessary. In fact, the bell uses the battery only because switching the voltage from one source to another in real-time is too complicated and too expensive for this type of device. Normally, the battery lasts for one year if the bell rings up to 5 times a day. The battery cannot power a lighted button because it usually requires too much power and would exhausted the battery very quick.



