SureFlapMicrochip Cat Door Connect with Hub Bundle - Door Opening: The Microchip Cat Door Flap Opening is 5 5/8" (w) by 4 3/4" (h

I LOVE this cat door. I don’t know what these other reviews are doing but this is a quality and sturdy door. And I’m particular with what I buy. All the things you can do from your smartphone besides being able to track your cat’s comings and goings makes it worth the price you pay. We have a cat that lives in our shed and keeps the rodent population to zero. With this door I can make sure he’s safely locked in at night and it also doesn’t allow strange cats or other wild animals to even enter the shed, keeping my cat safe from unknown "friends." On bad weather days I can even keep him restricted to inside with no outside access. ALL FROM MY PHONE. Love it! And my husband will say it was easy to install and to get it up and operating. One of the best inventions ever made when a cat mom is stressed whether her cats are safely tucked in bed at night or bad weather!!

*****UPDATE****I'VE HAD THIS FOR OVER A MONTH NOW. THE APP IS JUNK. THEY UPDATED IT WHILE WE WERE AWAY AND IT LOCKED MY CATS OUTSIDE.SECOND. NOW THE CURFEW MODE DOES NOT WORK. DO NOT. I REPEAT DO NOT BUY THIS UNLESS YOUI ARE WILLING TO LET YOUR PET DIE OUTSIDE IN THE HEAT OR COLD.All of this is plastic junk. I installed the door in wall next to the door.First off, you mount the door with screws from the outside. And screws are not long enough to reach the inside part. Not only that, they did not think about weather at all. I have to add caulking and other items to keep the weather out. So prepare to buy that as well.I needed two extensions each is only 2 inches. These are plastic crap that you need to duct tape together. They do not snap together nor does the lip go all the way around. You also need to seal them, unless you want water to come through and into your wall. And remember this is the tunnel from the outside that your cats will be using.Next, know that the outside trim piece is plastic and does not fit tightly around the plastic extensions. There is 1/8 inch space all the way around. Once again, get ready to caulk and seal or you will have water in your wall/door.Now, lets talk about the App. It sucks. Period. Once you have trained you cat to go through the door it reads the chip, which just a long number. You can change the number to the cat's name, BUT you must fill out ALL the profile data for the cat, including a sub bread. WTF?Next, to set the time zone, you know so you can use the curfew feature, it has EVERY SINGLE TIME ZONE LISTED AND NO WAY TO FIND YOUR CURRENT ONE. You scroll forever, past Madagascar, and still no Pacific time zone, listed. Again. WTF?You can turn off the dumb green cat ears. Trust me, when you see how bright they are, you will turn them off. If not, it's like having a stop light in your living room.Finally, the door is ok, but the cat must almost bump the door before it unlocks.I would not recommend this product. In fact, I wish I could return this and get something else.

Definitely a life saver, extremely impressive and easy to install.We have an automatic feeder with WiFi / camera for if or when we leave on short trips. Unfortunately the day after we left on a longer two week trip, I saw on the camera a stray cat chasing my cat away and eating all her food - every day. I couldn’t do anything as I watched my cat starve (not really starve, cats are survivors but what an inconvenience for her). That’s when I purchased this great product and a pellet gun! Easy to install, easy for my cat to use (only my cat can access her room), great app that’s easy to use, with lots of extra features including notifications and tracking. My kitty now has her own safe space without having to wear a collar that could possibly get hung up or lost. Absolutely love this product and highly recommend it. It made my new pellet gun completely not needed. See? It saved my cats life from starving by giving her a safe space and her own food. And it also saved that overly aggressive stray bully cats life that was taking her food for herself. Life saver!!!! Anybody what an unused pellet gun?