E-Collar ET-402 2 Dog Educator 3/4 Mile Remote Dog TrainerThe ET 402 Educator is the 2 Dog version of the ET 400, and like its 1 Dog counterpart, the ET 402 employs our proprietary blunt stimulation making it the most humane and effective dog training collar available. Loaded with unique features, including lock and set stimulation levels from 1 to 100, and the ability to set a boost level from 1 to 60, independently for each dog, the ET 402 allows the user to tailor the stimulation to each dogs temperament.