his nightlight features a dusk-to-dawn light. When the product is plugged into the power outlet, it will turn on automatically when the level of light in the room is below 10 lux. When the level of light in the room raises above 10 lux, it will switch off automatically to save electricity. This nightlight does not take away your outlet use, it adds an outlet in place of the one used to plug it in. Not only does this nightlight not take away your outlet use, it also adds a 2.1 AMP USB charging port.