If youíre looking for a training collar thatís great around the house as well as in the field, look no further than DT Systemsí H2O 1810 PLUS. This 1 mile range collar system has 16 levels of momentary (or Nick) and Continuous Stimulations. Both the collar unit and the transmitter are completely waterproof. In fact, the transmitter will actually float on water; perfect for all you waterfowlers who spend more time on the water than the ducks do. And if you ever decide to get more dogs, the H2O 1810 PLUS can expand up to a three dog system with Add-On Collars (sold separately DTH2OEC).