The light strings can be used outside during the whole spring and summer period. How cool is that? Sitting outside, have some good dinners, enjoying of long summer nights with really cosy party lights. The outdoor party light string is powered by LED lamps and is made of polyester garn, so they are water resistant. It's possible to use the outdoor light string with a transformator or by batteries by means of a battery pack. It takes AA batteries (not included). Which colour do you choose in your garden? Pastel, aqua or just white? We have it all!