Long battery life: CR2032 batteries included. 48 hours long battery life, longer working time than other's 24 hour fairy string lights Durable wire and bright bulbs: battery fairy lights are 7 feet in length, made of coated flexible silver wire. Wire is thin, almost invisible to see from distance. 20 mini led bulbs are equipped with big and bright chips, 4 inch spacing between led bulbs, 0.66 feet lead wire between the battery pack and the first light bulb IP65 waterproof: the light string is IP65 waterproof, could be immersed in water without worry of short circuit. ( Only the string lights is waterproof, the battery pack is not waterproof ) Safe: the starry string lights are low energy consumption, no overheat and remain cool after long hours usage, stay safe to touch Application: perfect copper lights for kids room, window, bedroom, picture wall, garden, patio, balcony, corridor, fence, shelf, cafe, flower shop, mall, New Year, birthday, potted landscape, evening party