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X-Sense AC Hardwired Combination Smoke and Carbon Monoxide Detector, Hardwired Interconnected Smoke and CO Detector Alarm with Replaceable Battery Backup, XP06, 1-Pack - Amazon.com
X-Sense Wireless Interconnected Combination Smoke and Carbon Monoxide Detector, 10-Year Battery Powered Fire and CO Alarm, SC06-W, 3-Pack - Amazon.com
X-Sense Wireless Interconnected Combination Smoke and Carbon Monoxide Detector, 10-Year Battery Powered Fire and CO Alarm, SC06-W, 1-Pack - Amazon.com
X-Sense Carbon Monoxide Detector Alarm with Digital LCD Display, CO Detector Alarm with 5-Year Replaceable Battery and Peak Value Memory, XC04-R - Amazon.com
X-Sense Smoke and Carbon Monoxide Detector Combo, Wireless Interconnected Combination Smoke and Carbon Monoxide Detector with LCD Display & 10-Year Battery, RF Interconnected Model, 1-Pack: Amazon.com: Tools & Home Improvement