When a human being approaches the light in the dark, it turns itself on automatically, and off after the person leaves.
It avoids the trouble of turning on the switch and it is never left on, which contributes to saving energy a lot.
Battery-operated sensor lightiECOPAj: ECOPA can be placed anywhere since it is battery-operated. Since no wiring is required, the installation is pretty easy.
Ceiling light with a motion detector : Since no wiring is required, the installation is pretty easy.