At nighttime, photoresistors detect the absence of ambient light and switch within the units. The light stays on till the batteries operate out or even the photoresistors detect light in the morning. I'll use this to power my Oxygen offer during power outages Any more. Experienced earlier scare without this https://itrolledmybrotherbyusinga14589.ourcodeblog.com/29702360/a-review-of-solar-power-lanterns