A chime doorbell uses a specialized sort of electromagnet called a solenoid. A solenoid is just an electromagnet where the coiled wire surrounds a metal piston. The piston contains magnetically conductive metal, so it can be moved backward or forward by the electromagnetic field.
Reference:
http://home.howstuffworks.com/doorbell3.htm
Tagalog translation of door bell: batingaw ng pinto
it is like a door bell
Gandeton
put a magnet up to the door bell
A electromagnetic bell works by a electrical circuit.
=== === the answer is 1831
A door bell
door bell
are nyc landlords required to provide and install front door bell
That's what the front door is for; for visitors. No 'decision' for permission is required. Your door-bell and your knocker is the invitation; even for strangers. Even if there's neither a door-bell or a knocker, anyone can come to your front door and knock. Even the police can come to your door, and have to knock or ring the bell to present you with a search warrant; or with a summons.
Because it is excited to see who is there :D
One can purchase a door bell on an online marketplace selling these specific kinds of bells. One could also visit one's nearest door retailer for purchasing different kinds of door bells.