How connecting doorbell and intercom (via wireless) in alarm

[lefevi 0]

Searching all the internet information about device connections such as doorbell and intercom at the entrance alarm DVR. I found something to contact wire, including the use of relays for circuit protection.

 

However, I need that communication will wirelessly by a space of about 10 meters. With wire have an idea, but via wireless complicates, I know need an interface to convey and receive the signal with the DVR. I thought of something like below, but I never saw something like:

 

http://www.ebay.com/itm/190745549593?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649

RF Wireless Transmitter and Receiver Kit Link Module 433Mhz for Remote Control.

 

Any help will be appreciated.