i have a full house alarm, and am getting an extention built onto the back of the house, we intend to use the new patio door as access so need to set the alarm from there as well as the existing front door, is it reasonably easy to retro fit a 2nd kepyad at the back door so that we can use either keypad to set/disarm the alarm, and does it require 240v or only alarm cable,
cheers
cheers