These amazing hanging lantern string lights can be used indoors or outdoors, and you have the option of how you wish to power them as they come with both a battery pack and a solar panel. When using the battery pack, it's possible to set a timer of 6 hours on, 18 hours off which will help to save battery power, or if using the solar panel outdoors, they will automatically switch on and off at dusk and dawn. The solar panel has 3 meters of cable, and the battery pack has 50cm of cable, and the lit length is 2.5 meters. The lanterns themselves are made from tyvek which is very tough and weatherproof, yet looks like a delicate traditional paper lantern. The lanterns have a diameter of 7.5cm and a length of 10cm. 6 warm white leds6 x tyvek lanterns, 2 x golden yellow, 2 x coral, 2 x jade green.lantern diameter 7.5cm, 10cm lengthdual powered, plug in either the battery pack, or the solar panel.solar panel outdoor use onlylights automatically turn on at duskbattery outdoor or indoor useilluminated length 2.5mlead wire length 3m to solar panel 50cm to battery packmaterial metal and tyvekbuilt in timer 6 hours on, 18 hours offindoor and outdoor use