$60 · 4 Kidde Smoke Detectors

Hardwired with 2×AA battery backup (not included). Model 20SAR-CA. Manufactured June 2024. They are a bit too sensitive for our house as the strong sensors seem to detect small insects crawling or flying into the unit (we have an older house with a decent amount of spiders and tiny bugs). We wanted to switch to non hardwired alarms anyways. $60 for the set of 4. Or $30 for 2.