Plastic caged string lights with filament effect Automatically adjusts brightness according to the amount of daylight received during the day Perfect for entertaining, outdoor dining and parties Designed to work all year round, even on a cloudy day. On a sunny day, the lights will operate at full brightness. On a cloudier day the lights will work at a lower brightness to conserve energy. Automatically adjusts brightness according to the amount of daylight received during the day, to provide light all year round.