It's so small, like the size of a medium hoop earring but for our 3 smaller dogs, it's perfect. I like that the ring that the magnet is on is actually like a ring for your keys so we can attach it easily to the dogs collars without trying to find another ring to connect them. Magnet is smaller than expected but it works their dog door and was at a decent price. Definitely buying more, including a large one for our large dog as a backup.

Much better than the ones from the manufacturer.

Works great on my solo pet doors. Was unable to get solo pet doors to respond to an order. So glad that Moores had a solution that works. Great customer service too!

I prefer this Collar "key" to the dog door to the other magnets that are covered in rubber (my dog destroys these) or glass, which are not as strong of a magnet, and also are attracted to other metal tags or connector rings and are more hidden from the electronic door lock. This key works more efficiently. Thanks.

great magnet-very small andworks perfectly-my puppy would yank the red tipped magnet off my older dog's collar-he cannot get to this one-yay!

A much improved product compared to the older rubber dipped magnets. Work great with magnetic door doors.

This is a great sturdy magnet for our dog door. Our dogs can go out anytime and it's wonderful.