Koopower 3xAA-L, Outdoor Battery String Lights, 8 Modes Dimmable IP65 Waterproof, 16.4ft 40 LED, Warm White, 2 Pack KooPower [2 Pack] 16 feet 40 LEDs battery-operated weatherproof string lights can be used indoors or out without trailing cables or an external power supply. Timing program (6 hours on, 18 hours off) provides a set-and-forget operation; The timer function will work only when you switch to 'TIMER'. Please set the mode you need before switching to 'TIMER'. Variable mode (8 Modes) provide the perfect solution for your decorative lighting needs; Memory Function: Once the mode is selected, the light will work in this mode next time and you don't need to worry about re-set until battery power is depleted. Dust- and waterproofing to IP 65 level makes these lights suitable for use in conditions where dust, rain, spraying water, snow or frost are likely. Perfect for use at Christmas, Easter, other celebration events or simply to give your home a novel warm inviting glow.