The ez-904 Easy Educator 4-Dog E-collar is a modern and effective training tool designed to tackle the most difficult behavioral challenges for up to 4 dogs. With a convenient transmitter capable of controlling multiple dogs at once, this trainer prioritizes safety with features like a maximum stimulation setting and lock and set function to prevent accidental overstimulation. The medium-range trainer is loaded with unique features, including a bar-shaped transmitter for easy operation and discreetness, a small receiver size that provides ample stimulation, and COS technology for clean stimulation without head jerking. The boost feature allows for adjustable stimulation levels, and the tapping sensation provides a gentle alternative to vibration. Trust the Easy Educator 4-Dog E-collar for humane and effective dog training.