Petsafe SD-400S Sportdog Field Trainer, Stubborn
This collar is easy to use and is very effective with our Labrador. It is much easier to use than our old collar, purchased several years ago for our other dog, and the actual collar unit is smaller and less cumbersome on the dog. The battery lasts for about 3 days before needing to be re-charged. Charging the collar and hand-held unit is very simple. The only drawback is that it takes about 12 hours to charge it, since we do a lot of RVing, powered by the generator when we are away from home. It has a good range with ample settings (tone only or tone & zap, and it is nice that the collar is water-tight. I chose this collar because of the ease of use and the range that it covers.

Fantastic product
I've had this product for about a month now, and I think it's great! I mainly use it to walk my mini dachshund (extremely independant and stubborn breed) so he has more room to roam. I charged it fully when I first got it, and I haven't had to recharge it yet. My dog responds to level 1 and actually listens to commands now. I haven't made sure it's fully waterproof yet, but it's been fine in the rain. I also haven't tested its full range--All I know is that it works best when you hold the transmitter around head level. This product is definitely worth the money!

Great
This is a great collar. Our once extremely stubborn great dane, minds the first time now and she hasn't broken our sliding glass door because she doesn't jump to the top of it anymore. She started responding on level 1 which surprised me. I tried it on my finger on level one and it's not comfortable , but it's not painful either.We do have to turn it up when we go on walks to keep her attention, but only to level 2. Normally I would have expected to already replaced the batteries 4-5 times by now (because of the spray collar we had in the past, that never controlled her behavior this well). We have only had to charge it 3 times and we've already had it almost a month. It's so nice not to have to change batteries. I really like this collar.

Miracle worker!
I purchased this collar for an 18 month old pit bull. She weighs about 50 lbs. and has a high tolerance to pain. I bought this collar because Cammy would bolt out the door whenever she got a chance and run endlessly. It was nearly impossible to get her back! After using the collar for about a week to train her to come, I have had amazing results. We are now able to go anywhere without a leash, and she comes without any electric stimulation almost every time. She usually responds to the lowest setting, except when she is very distracted, it may take a little more. Since I bought this collar we have been able to play in the yard without fear of her running away. I highly recommend this collar for anyone with a dog that likes to bolt or jump on visitors!

Changed my world
Following the guide that's included this trainer is great. The fact that it's rechargable is HUGE since it's easy to leave on and drain batteries. My dog has been swimming in ocean and fresh water with no problems.