The $24.95 LightKeeper Pro is the only gun you should have for the holidays, because you will shoot your eyes out. If you have an old strand of lights that is partially out, the LightKeeper can use an electrical impulse to repair the strand if the problem is caused by defective shunts.
For some of you this will be too late, since you've already decorated. But I don't write for you. You are obviously not a procrastinator and thereby a potential robot. And I don't write for robots.