Combo products refer to a combination of different dog training and control tools, such as a collar and leash set, or a collar and remote training device. These products offer a comprehensive solution for dog owners looking to train and control their furry friends. The specific features and functions of each combo product will vary, but they generally include a combination of tools that work together to promote positive behavior and obedience in dogs. Some common examples of combo products include collar and leash sets, collar and remote training sets, and collar and GPS tracking sets. These products are designed to make training and controlling your dog more convenient and effective.