The Xiaomi night light never shines unnecessarily. It starts only when necessary - it is activated automatically by your movement and then goes out again if the movement stops for 15 seconds. As a result, it saves your household's costs, and its electricity savings are really noticeable. The Xiaomi Mi Motion-Activated light only illuminates when it detects movement at a 120-degree viewing angle. It won't start unless the ambient light level is low - so you don't have to worry about glowing unnecessarily during the day. The white plastic lamp is powered by 3 AAA micropencil batteries, which you can replace at any time as needed. It emits a pleasant yellow light with a temperature of 2,800 K. You have a choice of 2 levels of lighting - lower intensity 4 lumens, or higher rate 25 lumens. Anyone can handle a simple installation.