:With lighting sensor to controlKilling grid powered by high voltage transformerSave and energy savingHow to test electric mosquito killer lamp?If you test fly zapper during the day, here is the suggestion to test.A. After receiving the product, check and make sure that the original state of the button switch is to bounce.B. Then plug the product into the power, the product is working and the light is on.C. Press the switch button first time, the light off, the product works. Meantime, the product is on the light control mode. D. Place an opaque piece of paper 5cm away from the product and aim the paper at the Light Sensor position of the product, wait for 1-2 second, the LED light of flies killer is on