InnooTech LED Christmas Tree Lights 4M 40 Heart White String Lights Outdoor Battery Operated Fairy Lights for Indoor, Kid's Bedroom, Home, Xmas, Party, Wedding, New Year Decoration 3 X AA battery operated suitable for Xmas tree and other parties decoration decoration on stuffs such as tent / car / bicycle portable and easy to store This light will turn off automatically after continuous lighting for 6 hours.