The H2O 1810 PLUS remote trainer comes with Nick Stimulation and Continuous Stimulation. This fully waterproof unit covers both basic and advanced training needs for both professionals and novice users alike. Whether you are knee-deep in cold icy waters or knee-deep in tall grass on a dry sunny day, the H2O PLUS is designed with the harshest environments in mind. H2O 1810 PLUS is expandable up to 3 collars 1800 Yard (1 Mile) Range FLOATING Transmitter with No-Slip/Soft-Grip rubber coating Maxx-Range internal collar antenna system Gentle touch system extra mild stimulation