The X-Sense Wireless Interlinked Smoke Alarm Detector offers enhanced safety with its wireless interconnection feature, ensuring all alarms sound when one is triggered. These alarms connect wirelessly using radio frequency with a transmission range of over 820 ft (250 m) in open air. The multi-pack comes pre-interconnected for instant use, and up to 24 Link+ wireless alarms can be connected together. You can also customize your wireless network by adding new alarms or creating separate networks. Built with a 10-year sensor and powered by a sealed 10-year lithium battery, this smoke alarm eliminates the need for battery replacements. Constructed from upgraded premium material, it is durable, corrosion-resistant, and flame-retardant. Conforms to EN 14604 Standard.