D.T. Systems H2O 1850 PLUS Add-On Upland Beeper Collar. Make your H2O 1850PLUS a 2-dog system. The H2O 1850 PLUS is a great collar that can be used in a wide variety of applications. 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 1850 collar is designed with the harshest environments in mind. Can be expanded to 2 dogs with H2O 1850 PLUS Add-On Collars. The H2O 1850 PLUS collar units are equipped with MAXX-Range 360 FM Antenna. The embedded MAXX-Range FM Antenna is woven into the collar strap and runs along the entire length of the strap, providing extended range without the drawback of an external antenna.
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