The 3 Pack Siterwell Photoelectric Smoke Alarm Detectors, Model GS517, is a reliable and effective home security solution. These smoke alarms are powered by batteries and feature a photoelectric smoke sensor to detect smoke quickly and accurately. The Siterwell brand ensures quality and trust in their product, making it a dependable choice for keeping your home safe from potential fires. With the model Siterlink GS517, you can rest assured knowing that your home is protected by a trusted and efficient smoke alarm system.