Review on 🔆 RUISI Motion Sensor Switch: Wireless Power-Saving Radar Detector for Indoor/Outdoor Spaces, Corridors, Pathways - Adjustable Smart Technology by Shawn Reiter

This radar sensor works great when something is working well. This sensor doesn't miss a single movement on my porch, when the wind blows and the tall ornamental grass moves, the light comes on. If you attach such a sensor to the basement ceiling and walk across the floor above the sensor, it will turn on the light. Yes, this sensor detects you through doors, walls, ceilings and floors and turns on the light. I still have a radar sensor in the garage, which is great, but there's no room for this sensor on the street or in the basement. FYI, this sensor is smaller than a US standard 4 inch round electrical box. To use it you will need a 3" round box such as Lowe's item #71003.