Trille - star fairylight with an ultra fine transparent copper wire that connects the 40 tiny little LED stars. The chain is 3.9 meters long and has bright and natural light. The Sirius String Light is battery operated and has a built-in timer function. The Sirius Lights will turn off automaticly after 6 hours, (if you dont turn them off your self). After 18 hours, the LED Lights will turn on again, and so it continues, if you do not use \'off\' button. Uses 2xAA batteries. Batteries not included. For indoor and outdoor use. The Sirius String Light comes in a beatiful gift box.