We have had systems installed in the past by Wanderguard, Secure Care, and Code Alert. All of these systems failed do to what they say "rf noise" (what ever that means". We were told we would never get a system to work unless we install special filters on our washer and other equipment. We looked into this and found the cost would be around $9000. 00. We were ready to give up and just lock all our doors to keep a patient elopment problem. After a last ditch, we were given a tip to try one last time with ELB Technologies. This company came to our site and installed our front door system within 1hour as a test. Guess what, it work perfect. They returned the next day and completed the rest or doors (9). The total cost for all the door systems was less than 1/2 the cost. Thanks so much ELB Technologies for all your help and support.