Although these lights looked very nice for a short while, they are not worth the money.  I had a set hung in each of three windows.  They were on timers and were set to be on about 6 hours each evening.  After one week, one set would not work at all.  After one and one-half weeks, a second set would only work on half the lights.  There is no place to change fuses as there are with most lights.  And then, after two weeks, that set did not work at all.  The third set did make it through the holiday season, however everytime they came on they were on a different flash setting and had to be reset every day.  Very disappointing.