ET-500 Einstein e-Collars for one dog and ET-502 e-Collars for two dogs are for training small to medium sized dogs, or for training dogs who are not stubborn and enjoy learning new things.
The ET-700 series and the ET-800 series are for training medium to large sized dogs, or for training stubborn, headstrong dogs.
With an 800-yard range and 0-100 correction levels Einstein e-Collars are suitable for pet owners and professional dog trainers.
