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THE H20 1820 PLUS EXPANDABLE SYSTEM allows you to add collars to control up to 3 collars. 16 adjustable intensity settings from the lightweight waterproof transmitter. Nick, Constant
stimulation and Positive Vibration modes. Rechargeable NiMH batteries in both the transmitter and collar. Storage
case included. One
mile range with Maxx-Range� embedded antenna. 6 month Collar Clinic warranty. 30 day money back guarantee.