As Gil said, some of the pigtails are hard to connect and disconnect when it's really cold out. If you live in cold climate, prepare for it. When I setup my Halloween display, it's warm enough that everything goes together easy. However, most of the time, when setting up my Christmas display, it's hard to connect the pigtails. I've started grabbing my wifes hair dryer, sticking it on an extension cord, and carrying that around with me to warm things up. A few seconds of warm air and the connectors slide together much better and much more completely . That said, I cannot count the number of time I've gotten yelled at because I forgot and left her hair dryer out in the garage.... Not a happy wife when she found out her hair drying has become a Christmas light tool.