The Dogtra EDGE RT Dog Training Collar offers a 1-mile range for powerful, reliable control and commands. Its 2-hour rapid charge batteries and kick, constant, and non-stimulating pager vibration make it easy to train with convenience and accuracy. Plus, its waterproof and expandable to a three-dog system, making training multiple dogs an effortless task. The extended contact points (5/8” to 3/4”) are perfect for any sized dog, even those as small as 35 lbs. This Dogtra EDGE RT Dog Training Collar is the perfect tool for the handy outdoorsman who desires control, accuracy, and convenience while training their dogs.