X-Sense Smoke Detector, Wireless Interconnected Fire Alarm with 10-Year Battery Life and Transmission Range of Over 820 ft, SD20-W, Pack of 6 RF Interconnected Model SD20-W 6-Pack

10-Year Lifespan: This smoke detector offers 10 years of continuous protection in a compact design; the built-in 10-year lithium battery will not need to be replaced for the life of the alarm
Wireless Connection: Up to 24 X-Sense Link+ wireless alarms, including smoke alarms, carbon monoxide alarms, and combination alarms, can be linked via RF technology, creating a wireless safety network that covers your whole house
Flexible Network: The battery operated smoke detectors in this multi-pack have been pre-connected; to customize your network, simply add new devices to the existing network or disconnect the devices to form new networks
Flame-Retardant Material: The housing of the wireless interconnected smoke detector is made of flame-retardant and high-temperature resistant ABS material, ensuring the durability and stable operation of the device
85 dB Alarm: When one fire alarm is triggered, all units will emit a loud 85 dB alarm, which can wake even the heaviest sleepers