The First Alert Smart Smoke and Carbon Monoxide Detector (model FSMCO600NVACCL1) measures approximately 5.5" x 6" and is designed for hardwired installation with smart home compatibility. Lowe's item #6032655. This unit is like new and in original box. Provides dual-sensor protection against both smoke and carbon monoxide, with smart alerts to keep your household informed. A reliable, code-compliant safety upgrade for any home.