X-Sense Wireless Interlinked Combination Smoke Alarm and Carbon Monoxide Detector with LCD Display & 10-Year Battery, Link+, SC07-W, 1-Pack RF Interconnected Model 1-pack

HEAR AN ALARM FROM ANYWHERE: If one alarm detects smoke or dangerous CO levels, all wireless interlinked units will activate, ensuring the earliest possible warning
WIDE COVERAGE FOR FULL HOME PROTECTION: Up to 24 X-Sense Link+ devices can be interlinked to create a wireless safety network for your entire house
2-IN-1 PROTECTION: Equipped with both a photoelectric smoke sensor and an electrochemical CO sensor to provide reliable protection against both smoke and CO
BUILT-IN 10-YEAR BATTERY: Features a built-in 10-year lithium battery, so you’ll never need to worry about replacing batteries during the lifetime of the unit
INFORMATIVE LCD: Displays real-time CO levels from 30–999 ppm (parts per million) taken from the surrounding air, as well as battery level and working status