I bought these and there is a gold UL sticker on the wire that states clearly in red text - INDOOR AND OUTDOOR USE. The light sockets and wires are similar to outdoor edison bulb string lights that you can buy at WalMart. BTW, these have to be assembled as all the parts come loose.
These lights are really cool. We've gotten positive feedback from many of our neighbors. They're definitely safe for outdoor use. Great price too. They do have to be assembled but it's not rocket science.