We have tested thousands of pet dogs and proven this collar to be very effective for pet dog training. After use, your beloved pet can quickly understand your instructions. This product can effectively prevent pet barking, biting and other bad behavior. Select the most suitable mode and upgrade it according to your needs and your dog. that you can easily train your dog in the yard or the park. The safety button lock prevents misuse or manipulation of the remote control. Waterproof and Adjustable Collar: your dog can swim or shower with the collar. This dog training collar is safe, comfortable and effective for pets over 2.5 kg.