I've gone through several auto doors for our chicken coop. The first one was a roll-up garage door style and it worked for a couple months before it got bound up. It technically had a built-in \"pressure sensor\", but it was only a motor load sensor (meaning that if the motor loaded down too much it would think that the door was crushing a chicken. However, in practice that sensor prevented the door from closing because of dirt in side rails, and at the same time it wasn't sensitive enough to stop it from crushing a chicken. Anyway, I've gotten a few things from Vevor and while they aren't a \"Namebrand\", they are becoming a nambrand among the sea of offbrand companies and I've been moderately happy with their products so I decided to give this coop door a try. My main criteria for a door was that it needed to be battery powered and it needed to have an actual sensor to keep it from crushing a chicken. This door has both an IR sensor (that detects warmth) and a motion sensor. Each of the sensors has a dedicated LED indicator so that you can see when they detect something. I've been really quite impressed with how well it works to keep from closing on a chicken. It takes AA batteries but it does have a DC input plug if you have a power supply or a small solar panel to hook up to it. The structure itself is fairly lightweight and flexible and I wanted to attach it to the vinyl siding on our coop, so I put a couple of aluminum angles on the vertical rails to stiffen it up and help protect it from damage. Overall I'd give this a full 5 stars. While I've only had this for a couple of months, it's still going strong. If it starts acting up in the future, I'll plan on coming back to update this review.