Thanx for your suggestion #3DDAVE.
I am looking for some solution not this advice. And yes you can communicate over long distances via email and posts which we were doing in earlier times. But i appreciate your idea of time machine, will think upon this.
I want to design a ding-dong door bell without electromagnet coil and don't want to use EMF for power source. I am looking for any mechanical alternative method to crack this. Pleaee support and give your suggestions/feedbacks.
