3 Things to Know About Robot Vacuum Cliff Sensors

Cliff sensors use infrared light to detect drops. They bounce a beam off the floor to measure distance. If the light doesn’t return quickly, the vacuum stops.

These sensors prevent falls down stairs. The vacuum halts before it drives off a ledge, protecting it from damage.

They work best on solid, non-reflective floors. Dark or shiny surfaces can confuse the sensor, but on most floors they are reliable.