Build in sensor and automated switch: the light comes on at night and goes off at dawn.it can stay in place well and handle a good mount of wind, rain and snow.Super easy installation. It can be easily mounted either vertically on staircases, paths, gardens, mailboxes, decks, docks and fences. The battery enables the light to run up to 9 hours through the night and recharge automatically during the day. The solar panel is able to gather solar energy even on overcast days. You don't need to do anything because the light itself will turn on at night and off during the day. These LEDs are more durable than conventional glass light bulbs and are more efficient.