First Alert Hardwired 120V Ionization Smoke Alarm (6-Pack)

6-pack contractor pack smoke alarm. 120-volt hardwired smoke alarm wires directly into your home's electrical system. Ionization smoke sensor reliably detects particles from fast-flaming fires. Can integrate with up to 12 other First Alert or BRK hardwired smoke detectors. Easy-to-access battery drawer. 9-volt battery included. Hassle-free installation, no need to rewire.