Best Seller | First Alert Smoke & Carbon Monoxide Detector 8.5 H x 6.7 W x 3.6 D in black | 3.6" L x 6.7" W x 8.5" H | Wayfair 1044807 This easy-to-install First Alert Z-Wave smoke and carbon monoxide alarm is designed for compatibility with certified First Alert enabled Z-Wave devices. It can send you mobile alerts in the event of an emergency and includes an insect-screened... more | | $56.90 FREE shipping go to store |