Try a different brand if you want a breakaway collar
919848
Doesnt breakaway like other breakaway collars.  Had to replace another brands breakaway collar after our puppy broke it off out cat and chewed it up.  This one done not breakaway as easily as our puppy has been tugging on it while the cat still had it one.  I would recommend a different brand.  Bell was a nice feature until it was crashed by the puppy.  If the breakaway part of the collar is not a concern this is a good collar.
1152320
There is safety and then there is down right poor design. This is the worst collar I have ever bought. The clasp pops open all the time. This collar pops open every time my cat is scratching her neck. She is smart and after a day, learned to pop it off all the time. It makes the collar worthless to me because She can not be identified if she accidentally gets outside and is found. I suppose it might be sufficient for a tiny kitten although I would be way too big. I strongly recommend you do not buy this collar as it is worthless.
1313113
I was super hopeful about this collar. My cats go outside and play in the woods in my back yard so I need a collar that will come off if they get caught up in something. I hoped the adjustable strength of the clasp would help my guys keep their collar on, but no luck. I bought this because of that feature, but also in hopes of finding a great reflective collar. I didn't even get the opportunity to see if that worked well, the collar was gone in less than a day. $12 down the drain. 2 stars because my cat didn't get stuck somewhere. Still looking for a collar we won't lose, I guess we go back to the cheap crappy ones from the store.
3456645
Being a Raiders fan this was great for our dog.
Unfortunately the collar constantly works its way loose. Decided to get a different collar as this one proved uselees.
1140346
We purchased these collars for our 2 Bull terriers. One of the dogs is not wearing the collar because it is too thick on a thick "bully" neck. The other one has been wearing the collar for a couple weeks and it is already unraveling. I think I will go to a leather rolled choke collar instead. Bull terriers are tough on toys and well just about everything!
4708916
Read more customers reviews on this product before purchasing-many of the 5 star reviews are paid reviews. Mine is being returned.
I know multiple people who use electronic dog fences and love them, but it must not be this brand.
The collar and control unit are made of extremely lightweight and cheap plastic. The collar is rechargeable-it requires a 9volt battery which is more difficult to put in than I would have thought and the screws come out easily. My collar is now duct taped together.
One of the two shock parts fell off within two weeks. Luckily inside so I could find it and put it back together.
The collar beeps/shocks for inconsistent intervals-not the 15 seconds it is supposed to.
We installed everything correctly, turned it on and the unit just started beeping. We couldn't figure out why, but increasing the boundary setting fixed it, so 4 is the minimum it could go. We have a big yard, so that's not too much of an issue, but doesn't help me trust this product.
The flags are cheap as well, but not necessarily worth returning because of. The white flag parts come off of the plastic stick if it gets even slightly windy.

In summary: I'm returning it to Amazon and researching brands such as PetSafe or DogTra. They're more expensive, but not a piece of cheap plastic junk.
651120
I wanted this lanyard for work, I have the same one for my house/car keys and love the breakaway feature.  This one has the snap to breakaway, but I can pull on it as hard as I can and the snap will not give.  Seems to defeat the purpose.  Looks pretty, but the snap and ring are way too tight and will not budge.
3582868
I bought this for my Great Dane.  I had been using a gentle leader but I saw this one and really liked the idea of the padding for the bridge of her nose.  This collar is put on a bit differently from the gentle leader brand-- it is almost like putting a bridle on a horse the way it needs to slip over the head.  Problem: The clasp broke- only it broke where it would not come off the dogs head.  This happened about 3.5 weeks after I received it.  Had everything to do with the quality of the product.  I do not recommend because of this.
3742645
Updated

Fence works well, collar is horrible.  First collar randomly shocked my dog.  I made the seller aware and they shipped me a replace within two days.  I have spent the past two weeks watching my dog randomly get shocked in the middle of the yard, when she happens to run at all in the back yard it beeps and shocks her.  My daughter will not let her wear the collar when they are playing in the yard cause it randomly shocks her, no where near the fence.  When my dog wants to go outside, I put the collar on, she chooses not to go outside because she is afraid of the collar.  Poor quality, and no way to reach seller to help
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Purchased cause of the price, works.  The collar was broken when we got it.  Had two plastic washers holding it on and they were broken when we put the collar on our dog.  The first time she put it on it fell on the ground.  Used a knife made two smaller holes screwed the collar on and its stayed since.  Flags are basically straws with a flag on the top, need soft soil to put in.  Had to buy extra wire as the 500ft wasn't enough.  Make sure to measure your yard to make sure you have enough.

Training was easy, 3 day training no shock and 4 day dog tempted the fence and learned quickly, hasn't ventured near the fence since.
2999846
This collar appears to be very well made but the design is not very good. The d-ring is entirely too close to the Buckle and interferes with it.
2628810
The collar can't be used, dogs broke right through it.  The whole thing only worked intermittently, which isn't a good thing if your dog is running down the street.  Don't buy. Going to try to get out money back...but we will see.
1747057
Very Disappointed in these collars.  I bought 2 and they do not work like I thought they would.  Collar keeps shifting and coming off.  Does not keep my dog from barking.  Only seems to go off when he starts scratching at his collar. Again disappointed.
2896374
I put this on my giant schnauzer and will never use it again.  The more he barked the more it hurt and he was terrified.  I had to remove it as quickly as possible.  There is no setting so that you could start out low and build up as necessary.  I would not recommend this collar to anyone.  Instead I am using the e-collar, that way I can control how much of a correction he gets.
2698523
Love the collar and the concept but my kitty Carlton doesn't like the big buckle around his neck. Unfortunately, it became a paperweight.
4198665
Collar only works effectively within 15 ft.  After 15ft the collar works inconsistently.  Have used several of these collars and would not buy this model again!
2021521
No sooner than I put it on my cat, it was off.  I tried multiple times and each and every time, it opened up.  I tried making it tighter, that didn't work.  I tried loosening it, that didn't work.  I would NOT recommend this collar.
3662254
Will not fit a 1 inch thick collar, it is not as nicely made as other collar clips that I have. I will be purchasing a different one for my dog. Unless you are putting this on a puppy collar or other thin width clear, don't bother with it.