He and I programmed it together while he was here. He is very young.This was the first timer switch that he installed of this kind. He had to do some research and digging and talking to his electrician friends. But when he came out he was prepared and he put it in there.They're so tiny it's like a mini computer.You just picture a switch on your wall. It's only as large as that switch it just fits right in there.You have to program it with a pen, because you can't do it with your fingers. I think he really did his homework, I had to read some things for him.He hadn't read the package insert. You have to set it up correctly. We did that together. I always like to be around when anybody is working in my home. I like the guys who let me participate. He and I got along very well. I would recommend him because he is willing to go the distance in terms of something that is out of the ordinary. He does his homework, he comes prepared and he is just easy to work with. I don't recall him wearing booties. He is always here on a nice day. He carefully cleans up. He is very good about that for a young guy.