This X-Sense 5-pack of smoke detectors is $94 at Amazon, matching its Amazon all-time low and below its 90-day average of $106. Each alarm has a sealed 10-year battery, so there are no battery swaps for a decade.
The alarms work on their own and do not connect to each other or to an app. Shipping is free.
Buy Now at Amazon
Features 10-year lithium battery power UL 217 certified reliable detection Standalone operation, no Wi-Fi required Photoelectric sensor reduces nuisance alarms Tool-free installation with included hardware