The product can turn on or turn off light by automatically according to ambient-light. Ambient-temperature and humidity can’t affect it. It is not only convenient but also practical; it can control the load working only at night. For instance road light, garden light etc. INSTALLATION: Switch off the power and connect the wire as per the connection-wire diagram. Please install the item in the correct orientation with the metal bracket and according to the correct installation place install the item with the enclosed inflated screws. (See the figure on the right) TEST: Slide the LUX knob to position (-) and switch on the power. When you test in daytime. You should cover a black opaque cloth on the product. When the cloth mantles the detection window of the photocell, the ambient light of the photocell is less than 5 LUX, the lamp will be on. When you take off this cloth, the lamp will be off automatically NOTE: In front of the photocell, it should be no obstruction effecting to accept natural light; In front of the photocell, it should be no swaying object. Don’t install the photocell under the light or in the place where the light will be irradiated to the photocell.