Applications The S1209 Series photoelectric smoke alarms are for use as an evacuation device in all dwelling units, including but not limited to homes, apartments, hospitals, hotels and motels. Available in two models, the S1209 Series is engineered to virtually eliminate nuisance alarms and deliver outstanding performance wherever reliable smoke detection is required. The S1209 Series is provided with a 9V alkaline battery for back-up in the event building power is lost. The battery drawer provides easy replacement without removing the unit from the wall or ceiling. The Gentex S1209 Series is provided with a push button self test and functionality test feature. The push button self test verifies power operation and tests battery levels. The push and hold button functionality test analyzes the photoelectric sensing chamber for proper operation of smoke alarm. The self and functionality tests are in compliance with NFPA 72 and ANSI/UL Standards. Features of the smoke alarm series include DUALINK® tandem capabilities with Gentex tandem interconnect capable alarms products. Options include Form A/Form C dry contacts for remote annunciation. The S1209 smoke alarms are ANSI/UL 217 and are warranted for one year from date of purchase.