I replace my standard doorbell with a 433mhz wireless from Conrad.
I have chosen this one because it has a very good and loud enough sound quality. And best of all it's easy to connect this doorbell to home automation.
In the sender (doorbell pushbutton) the is a solid switch which has much better contacts then a traditional one.
So very simple remove the old doorbell and connect the 2 wires to new switch (photo) together with a Diode, otherwise it won't work properly.
The existing wire you can use the connect to an input output module like the RFXcom, IPPower, Poseidon etc, or in my case connect it to a Visonic MCT-100 (photo).
The distance it can reach according to the manual is 200 meter, we all know thats not the case. But mostly all the devices are within 5 meters, so no problems with that. In my case (until now) the doorbell is working perfect and the images are still appearing on bwired http://www.bwired.nl/Doorimages.asp
If you look very good, you can even see that the LED is on (only when pushed).
The bell has 8 melodies to choose from, even a dog is in there [:)]
The Melody can only be changed from within the doorbell pushbutton, so not very handy! But for the freaks it's possible to connect a wire the that seperate microswitch as well and change the melody automatic as well [:D]
<hr noshade size="1"><font size="1">Pieter Knuvers
<i>Online House in the netherlands. Domotica, Home Automation.</i></font id="size1">