GSI Super Quality Ultra-Safe Electronic Remote Control Dog Training Collar System - Includes Transmitter, Waterproof Receiver and Secure Collar - 300 Yard Range - Vibrations and Whistle Functions 2 Levels of Vibrations and Whistle - Will Summon Trained Dog Great Training Tool, Connect Receiver To Adjustable Collar Ability to Train Dog To Respond To Different Sound Tempos Great System For Dogs That Don't Respong To Regular Training, HUGE Range - 300 Yards Ideal for the Great Outdoors or for Inside the Home, For the Professional Trainer or the Private Owner