X-Sense Wireless Interlinked Smoke Alarm Detector with Sealed 10-Year Battery, Interconnected Fire Alarm Conforms to EN 14604 Standard, SD19-W, Link+, 3-Pack by Amazon.co.uk

• Detection Anywhere: Features wireless interconnection so that if one alarm is triggered, they all go off, and they stay connected using radio frequency with a transmission range over 820 ft (250 m) in the open air

• Ready to Use: The multi-pack interlinked smoke alarm have already been interconnected for instant use, and you can connect up to 24 Link+ wireless alarms at a time

• Customizable Wireless Network: For a customized network, add new alarms to the existing network, or disconnect the devices and create multiple networks

• Battery Powered Smoke Alarm: Built with a 10-year sensor and powered by a sealed 10-year lithium battery that doesn\u2019t need to be replaced

• Premium Quality Material: This interlinked smoke alarm is made from an upgraded premium material that is durable, corrosion-resistant, and flame-retardant