Thanks for the information. I moved the receiver away from our WIFI and LED TVs, etc. and it seems to be fine now. ? Batteries were fresh and of good quality DURACELL / PROCELL Battery . We've had the system for about 7 years, I believe. When my son's family has gone on vacations, I placed the other sensor near their driveway, about 200 yards away and it worked fine! Great system!