First Alert SA9120BPCN Hardwired Smoke Detector

First Alert SA9120BPCN Hardwired Smoke Detector First Alert Replacement Hardwired Smoke Alarm (Model SA9120B) is 120V AC powered alarm with 9V battery backup in the event of power failure. The alarm can be interconnected with up to 12 other compatible smoke alarms and six compatible devices such as bells and horns. Weight: .67 Pounds Package Quantity: 1 Requires Hardwired Installation: Yes Battery: 1 9-Volt Alkaline, Required, Included Please do not hesitate to reach out if you have any questions or need us to provide another photo. D4B