Novelty Lights, Inc. LED 50 light battery powered Christmas light string are for holiday and special event lighting when there is no power supply. These work great for craft lighting, such as, lighting wine bottles, glass blocks, and wreaths. These super bright battery operated LED lights have have 50 wide angle 5MM bulbs that run on 3 D batteries (not included).  Our 50 LED battery operated lights are built to last using a weatherproof battery case with clamps making this unit perfect for indoor/outdoor use.  Each unit also comes with an optional timer function.  Simply turn the timer on when you want the lights to come on.  Once the timer is set the lights will come on at the same time every day and stay on for 6 hours. We have tested these battery sets with fresh batteries and last up to 2 weeks or 40 hours.  Ideal for decorating where power is unavailable or simply getting rid of the extension cords.