Since 1985, A-Bell Alarms Company has been providing intrusion detection devices to homes and businesses in Murrieta. It interlinks security and doorbell cameras, smoke and leak detectors, and thermostat controls. It designs smart systems that fit homeowners' distinct safety needs. Business co-founder Kathy Sizemore understands the importance of burglar-proof properties after intruders broke into her childhood home multiple times in the past. The family-owned business maintains a TMA-certified central monitoring station. It is a Resideo premier dealer and a member of the Inland Empire Alarm Association.