Smoke Detectors and Fire Alarms Fire Safety, Gentex, Safety & Security, Tools & Home Improvement Gentex 7100F Photoelectric Smoke Alarm Review by CheatingMutant May 19, 2018 No Comments Photoelectric Smoke Alarm, 120V-Ac Power, Tandem Interconnect Capability Up To 6 Units. Ten Leads, Horn Included. – Manufacturer: Gentex.