This chicken door works great. It was easy to install, easy to program and is very reliable. I installed mine 2 months ago and it hasn't failed once. Someone mentioned in a previous review that it eats up batteries. Well, it's been 2 months and I haven't had to replace the batteries yet. The only thing I don't like about it is that the description said it comes with an ac adapter... it came with something they're apparently calling an adapter, but it doesn't look like any adapter I've seen before. It's like an alligator clip with 2 wires coming out of it. I have no idea how it's supposed to work. But, the batteries are working fine.