This is the DSC kit of choice for residential and small business applications. The RFK-5501 keypad's built in wireless receiver will allow the use of the wide variety of DSC wireless devices available at Amazon. DSC kits for some reason don't include a transformer, no biggie, those are available below as well.
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The module emulates a keypad on your system allowing the Envisalink 3 to communicate alarm panel status directly to you over the Internet, also allowing you to control your system from your computer or smartphone. All this with no monthly fees. If you need professional monitoring for your insurance company they can provide that too. This is a great deal for the do-it-yourself security enthusiast.