BT R edcare is the best possible kind of alarm monitoring as it monitors your alarm 24/7 via something called the ‘low-tone' (a permanent continuous tone) on the BT line, this means that your alarm will communicate continuously with the alarm receiving centre, even to let it know if your phone line has been cut. For higher risk sites, like business , the R edcare is further supported with a wireless back up path, which means that signals will continue to get through even after the line has been cut.