Opened the box and hung up two sets of lights around the living room plugged them in and the first half of the first string wont light up!! The second half of the first string and the second string were working fine. I took them down and hung up the second string and put the first string back into the box and the same thing happened half lit half unlit. I plugged them in and put the string up around the window first and then back down again but I've never had a problem at christmas time doing that. No exposed wires or lose bulbs they're brand new! This product is advertised as "when one bulb is out the rest stay lit" so I'm pretty frustrated that I now have to go back to the store to return them due to them not lighting up! I imagine if they had worked this year they definately wouldn't work next year! I wouldn't recommend these lights. Just trying to warn you that your kids will be let down.