High Tech Pet Genuine Power Pet Brand Automatic Pet Door Collar from Water Resistant - Rugged - Light Weight - Long Life Battery Included - Directional Ultrasonic Signal - USA Customer Service

I was surprised at its size. Our lil guy doesn't seem to even notice it. The ONLY thing I do not like, is that the manufacturer, chose to create a "casing" for the battery, thereby highly increasing the price of the battery. Fortunately, I was able to find others on the internet who also hated this and were able to use a standard battery (I can't remember the number now) and they used an Exacto knife to remove the special "casing" that the factory uses. Being careful not to destroy it. They, they found another battery that is the same size and specs. They put the casing back on, and while no one seems to be able to spot weld it again, taping it seems to work just fine. I was able to order some extra batteries from E-bay that were at a more resonable price. But when it comes time to replace, I'll try to removing the case thing. ;)

Works great, but it’s worth getting the plastic protector for it. And don’t put the screws in too tight. It breaks the cover plate super easy.

My golden retriever had her Collar on and splashed in the river. It was not submerged and it stopped working. Had it only for 25 days and the company replaced it. My other dog has had hers for three months and no issues. It works great with their electronic dog door and the dogs love it as they could go in and out to the backyard as they please

a big improvement on the older version. if you have snow, and a dog that loves to play in it, spend a few extra dollars for this unit, it will last longer and wont get broken apart for doggy snow bank or back yard grass neck rubs, The biggest issue with all there collars is that metal disk sitting out front. Static from dog rubbing self on rugs has burned 2 units out, so I need to keep a spare on hand.

I was using the MS-4 collars for our Power Pet Medium Electronic Pet Door PX-1. We had issues with dirt, hair, and water getting inside the collar causing it to stop transmitting. When one of the MS-4 collars broke, I decided to try the MS-5. Here are my thoughts: 1- this is the type of collar all units should come with by default. 2- the enclosure is secured by a small screw which is much more secure than the MS-4 plastic clamshell. 3 - this type of collar is more expensive up front, but it makes it easier to use generic batteries instead of the High Tech Pet batteries which are severely overpriced. See details below on how to do this. To save a lot of money on batteries, follow these steps to use generic batteries instead. This will take <5 mins once you've done it once, so don't be scared of the steps: Step 1: Buy CR2430 batteries (any brand will be fine) Step 2: On a dead High Tech Pet battery, take note of the two sides - One side has a donut shaped white sticker under some foil, and the other side has a circular white sticker. You will need to be careful in the following steps but it is easy. Make sure you keep track of which way the battery is oriented so you can replace your generic battery properly. Step 3: Peel the circular sticker off without ripping it. Under the sticker you can see two foil tabs welded to the battery. Using an exacto-knife (or something similar) carefully pop the tabs off of the battery without ripping or cutting them. They should come off as one dented looking tab. Step 4: Now that the tabs are popped off, remove the foil donut and underlying sticker as one piece (again without ripping it). You should now have three separate parts: the foil donut with foil ring combined, the battery, and the top circle sticker. Step 5: Replace the battery with a new one: Make sure you place the foil donut on the battery in the right orientation. Now that the battery is loosely placed inside of the donut, fold the tabs back down onto the back of the battery. These seem very loose, but you will fix that later. Step 6: Place the circular sticker over the tabs. Step 7: In order to make sure the tabs stay "squished" down to the battery, I used a thin piece of cardboard. Cut a circle the same size as the circular sticker out of a piece of cardboard. You will sandwich this cardboard on top of the battery when you do the final install in the collar. Step 8: Place the battery back into the collar, with the donut facing down onto the springs. Step 9: Place your cardboard circle on top of the battery's solid circle sticker. Step 10: Close the back of the case. If your cardboard is too thick you wont be able to close it properly. I like the MS-5 collars because they use a screw instead of a clip to stay closed, but this works with both MS-4 and MS-5 collars. Congratulations - you just saved tons of money of the lifetime of your door. Especially with 3+ animals...