Door bell

Video
http://www.ehow.com/video_4418498_installing-new-doorbell-unit.html
Link
http://www.doityourself.com/stry/h2installadoorbell
The link i find was interesting to me because it gave me information about wireless door bells. I never took the time in realised that there are wireless door bells. This is the material need to install a boor bell
Doorbell ,insulated Staples  ,transformer ,hammer ,buzzer ,pliers ,  Doorbell Button,   Stapler,   Chime Side-Cutter Pliers, keyhole, Saw Low-Voltage Tester, bell wire ,  electricians' tape, screwdriver, and screws. I have learned that newer houses have tansformers built into the door bell but with older houses you have to buy the tansformers separate. The simpliest part of installing a doorbell is the wiring. When you want a door bell on both the front in back door you have to wire both of the doors on one wire.