First Put Device In Plug And Start The Switch, Second Make Darkness As Possible, If You Want To Check Product In Day Light Then Cover The Sensor (Ldr)(Located Below The Product) Properly And Light Will Glow. This Lamp Only Work At Dark Night. Please Switched OFF the Lights. Romantic bed lamp, Automatic Sensor, Creative mushroom shape It is an automatic sensor Night LED bulb, so it will work when the room is completely dark Color Changing & Power Saving LED Mushroom Lamp!! This Lamp has Power Saving Sensors. Works in Dark. It is an automatic sensor Night LED bulbs,so it will work when the room is completely dark. Another way to check is to completely cover the sensor at the bottom . It will then turn on.