Knirke - String lights with an ultra-thin transparent green wire that connects the 40 tiny LED lights. The string is 3.9 meters long and emits bright, natural light. The Sirius string lights are battery-operated and feature a built-in timer function. The lights automatically turn off after 6 hours if not manually switched off. After 18 hours, the LED lights turn back on and continue this cycle unless the off button is pressed. It requires 3 AA batteries, which are not included. Suitable for indoor and outdoor use. The Sirius string lights come in a beautiful gift box.