Perfect for the companion dog owner. Features non-stimulating vibration Pager mode and two types of stimulation: Nick and Constant. Each is selected with separate large transmitter buttons. Intensity selected with patented rheostat dial next to the antenna on the transmitter. The transmitter is smaller than a deck of cards and the waterproof collar is half that size. Very convenient to use and easy to operate. Receives signal at 100 plus yards. Rechargeable Ni-Mh batteries, charger included. With every day use the batteries will last for 1 week between charges. Recommended for dogs 40lbs. and under. 6 month Collar Clinic warranty, 30 day money back guarantee.