The Educator ET-802 2 Dog Boss 1 Mile Big Dog Remote Trainer is a highly advanced and effective pet training aid. With a range of 1 mile, this remote training system allows you to train your dogs from a distance. The transmitter offers user-selectable stimulation levels from 1 to 100, ensuring that you can find the right level for your dogs' needs. The Lock and Set feature prevents accidental overstimulation, while the blue LCD display shows the stimulation level at all times. The boost feature provides more powerful stimulation when needed, with adjustable levels from 1 to 60. The ergonomic stopwatch design of the transmitter allows you to keep an eye on your dogs while training.