We hung these from all the stanchions on our deck railings at the beginning of the summer.  I'm a fan of white lights, my husband likes color - and I love my husband, so I put them on the color setting.  They transition slowly from red to green to blue and back on the color setting, rather than twinkling or flashing which is restful rather than distracting.  I took them down at the end of fall and put them away.  They weathered well in our blistering sunlight and frequent rain storms.  All of them still looked like new and worked just fine. I'm looking forward to trying out the white cycle as soon as things warm up around here.