The owl and outer ring are two separate lights. Use together for a brighter light or separately for a low glow. Both lights are also adjustable which makes it easy to check on your children without disturbing them. This light can be left on all night or set to switch off automatically. The voice activated sound sensor will switch on the warm glowing light if your child wakes up in the night. You can set the timer to automatically switch off once your child has dropped off to sleep. Lou the owl is a compact light that is powered by batteries or mains electricity.