X-Sense 10-Year Battery Wireless Interconnected Smoke Detector Fire Alarm with Over 820 ft Transmission Range, SD19-W, 3-Pack

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 detectors have already been connected 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 devices 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’t need to be replaced Premium Quality Material: This smoke detector is made from an upgraded premium material that is durable, corrosion-resistant, and flame-retardant