lefevi

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.

I'm trying to work out how to connect a DVR with an alarm sensor. I would like to connect an alarm sensor along with the DVR for when a trigger occurs (when armed) dvr automatically start recording images (or send by e-mail, or take some action like a siren). Att