【4 Effective Training Modes & Safe】-? The dog training collar helps you teach your dog good behavior in 4 modes (beep/vibration/static electricity). Designed for pet owners, dog handlers as well as professional trainers, this electric dog training collar corrects annoying habits like barking, chewing, biting and digging. Wait and greet a polite furry friend with help. 【Adjustable for Dogs of All Sizes】- Unlike those complicated dog training collars with a hundred levels, the static level in the hunting dog training with 4 collars is reduced to 10. It is easier for the dog to feel the difference clearly and the training will be more effective. In addition, this training collar is adjustable for small/medium/large dogs in size between 25-68cm. Whether it's a big dog or a puppy, it's all suitable. 【Long Battery Life Up to 45 Days】- The remote control and receiver of the large dog training collar are rechargeable. The waterproof dog training collar can be easily charged via USB on any USB