X-Sense Wireless Smoke and Carbon Monoxide Dectector

•ENTIRE HOUSE NOTIFICATION: If one alarm goes off, all other interlinked alarms will follow suit, alerting you to danger regardless of where you are •WIDE COVERAGE FOR FULL HOME PROTECTION: •Interlinks with up to 24 X-Sense smoke, CO, or combination alarms in a network, ensuring your entire house is fully protected •-IN-1 PROTECTION: Built with a photoelectric smoke sensor and an electrochemical CO sensor to protect your home from 2 potentially deadly threats •BUILT-IN 10-YEAR BATTERY: Uninterrupted 24/7 monitoring with a 10-year sealed lithium battery, freeing you from frequent battery replacement •60-day money-back guarantee, 5-year warranty, and lifetime customer support There are 2 available. Price is per unit.