We bought four of these strands of lights for the outdoor of our home for Christmas, within the first two weeks we had used all the extra bulbs they came with to replace ones that have burnt out. Then another strand had burnt out and when I went to Canadian Tire to ask for replacement bulbs they don't sell replacement bulbs for the kind we have. I ended up buying a whole new set of a different make which work better. Two days ago I plug in our lights and a strand from the first set sizzled and crackled and burnt completely out. We have just given up on lights outside until next year. Horrible product!!!!