It features a 400-yard range, 2-hour rapid charge batteries and Dogtra s reputation as the world s finest e-collar. Now the unit can be expanded to train two dogs at once. Features: Reduced receiver/collar designed for smaller dogs Precise stimulation level (0-100) 400-yard range 'Nick', 'Constant' and non-stimulating pager 2-hour quick charge Fully waterproof collar/receiver and water-resistant transmitter LED battery life indicator Expandable to two dogs (additional collar sold separately) Package Contents 1 - Transmitter 1 - Receiver Battery charger and splitter cable Owner's manual