Right now there are 147 deals from Amazon Resale, formerly Amazon Warehouse Deals, in Tools & Home Improvement › Safety & Security › Household Sensors & Alarms. These are inspected returns and open-box items that Amazon sells and ships itself. WarehouseHunter puts each one next to its current new price, so you can see what you save at a glance.

Brands with the most offers here: First Alert, SITERWELL, YoLink, Moen, X-Sense, Kidde, KLEIN TOOLS, Safe T Alert. Every item is a one-off, so the stock moves all day and new deals keep arriving.