The Premier 100 Timelights Christmas lights are battery operated and use superbright, energy-efficient LEDs that are long lasting and durable. They come with an 8-setting multi-action controller featuring a built-in 6 hours on/18 hours off timer. These lights require 3 AA batteries, which are not included. They are also available in multi-coloured and warm white. The 9.9m lit length makes them suitable for a variety of indoor and outdoor uses, and they can last up to 30 days on a single set of batteries.