someone has not done a proper rf sig test,prob not have the meter to do it,(costs a bit o dosh)i have never had any probs with the i ons,we have fitted a lot of them,the bell box is trash,apart from that,i find them fine ,i dont think the radio keypad is up to much,it can only be used to set and unset,you cant reset the system after an alarm from it,not much use unless they have changed it now,
gts, September 2012