X-Sense Smart Carbon Monoxide Detector XC01-M, an Accessory for FS31 or FS51 Smoke Alarm Kit, Wireless Interconnected Portable CO Detector, Model XC01-M, 1-Pack

X-Sense Smart Carbon Monoxide Detector, Wi-Fi CO Detector, Real-Time Push Notifications via X-Sense Home Security App, Replaceable Battery, Optional 24/7 Professional Monitoring Service, XC04-WX

X-Sense Wireless Interconnected Combination Smoke and Carbon Monoxide Detector with Large Silence Button, Over 820 ft Transmission Range, XP01-W, 1-Pack

X-Sense Hardwired Combination Smoke and Carbon Monoxide Detector, Hardwired Interconnected Smoke and CO Detector Alarm with Replaceable Battery Backup, XP04, 1-Pack

X-Sense 10-Year Battery Smoke and Carbon Monoxide Detector with LCD Display, Dual Sensor Smoke and CO Alarm Complies with UL 217 & UL 2034 Standards, Auto-Check, SC08, 1-Pack