X-Sense Wireless Interlinked Combination Smoke Alarm and Carbon Monoxide Detector with LCD Display & 10-Year Battery, SC07-W, Link+, 3-Pack by Amazon.co.uk

• 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 interconnected to create a wireless safety network for your entire house. Attention: X-Sense currently DO NOT SELL Interconnected Heat Alarms

• 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\u2019ll never need to worry about replacing batteries during the lifetime of the unit

• INFORMATIVE LCD: Displays real-time CO levels from 30\u2013999 ppm (parts per million) taken from the surrounding air, as well as battery level and working status