Gentex Corporation of Zeeland, Michigan, has introduced the Gentex Firebyrd Series, a photoelectric single- or multiple-station smoke alarm for use in commercial applications. The series is engineered to virtually eliminate nuisance alarms and deliver outstanding performance. The GN-200 Series is a 120-VAC hardwired smoke alarm. The GN 200 Series includes a 9 VDC alkaline battery backup, and it provides for easy battery replacement without removing the unit from the wall or ceiling. Both series produce an 85-decibel continuous tone, while the GN-203 and GN-303 produce an 85-decibel temporal three evacuation tone. All models include a pushbutton test to simulate smoke, a mounting bracket, a Sure-Lock locking pin to deter tampering, a quick-disconnect wire harness, and tandem capabilities for connecting with other smoke alarms.