The H2O1810-Plus is a great collar system that can be used in a wide variety of applications. This s 2 dog systym that is 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 is designed with the harshest environments in mind.. It offers Maxx-RangeTM, the industry's only internally woven antenna in the collar. With up to a one mile range, they are perfect for hunting, basic obedience and professional training. H20 series collars feature Sixteen levels of stimulation intensity, with an easy 'no-look' clicking intensity selection dial. Easy one hand operation allows for maximum control and safety. Nick and Continuous Stimulations come standard on every model in the H2O 1800 series line-up. Additional features include Positive Vibration, Jump stimulation, Rise stimulation, and a beeper with Locate, Run/Point and Point only modes. The transmitter and collars are both 100% waterproof, and the collar can be worn even when the dog is submerged. The H20 Series Dog Training Collar is durable, safe and very humane when used correctly. The automatic safety shut-off feature stops the stimulus on both the transmitter and the receiver to prevent accidental or prolonged stimulation.