Function only in the dark environment automatically start . when the environment is bright auto sleep Automatic sensing: the light will illuminate when you get within 3 meters of it and it will go out 20 seconds after you walk beyond its sensing range Simple installation: Built-in a magnetic iron inside which can adsorb it on the iron-made surface such as fridge . meanwhile a 3m dual-side adhesive is provided to adhere to the surface of non-metal places High brightness . 6 LEDs supplies sufficient light in its area and it is energy-saving Battery-Operated: powered by 3 AAA batteries (not included) It is ideal for corridors . workshops . basements . indoor garages . stairwells . doorways . closets . and other dark places in your house NOTE: This motion detection light is not waterproof.