4 Training Modes: Our dog training collar provides 4 working modes, namely shock/vibration/light/sound, vibration and shock are adjustable. The remote control has 1-99 levels of customized shock and vibration, choose the appropriate level for your dog when using it so that you can better control your dog's behavior and help your pet eliminate bad behavior. Longevity: The remote control uses advanced transmission technology, which eliminates the need to directly aim at the receiver. The remote control messages can penetrate walls and other obstacles, making it easier to train your dog in the park or backyard. Super Waterproof: The nylon collar receiver can be used normally when the dog drinks water or on rainy days. Dogs can swim and dive with excellent waterproof performance! The collar is made of high-quality nylon material, which is soft and breathable and will not hurt your pet's neck like other leather collars. The length of the collar can be adjusted to fit all sizes of dogs.