Rated 5 out of 5 by Nuttysetters Comfortable, excellent range, variable settings
I ordered this collar for a ten month old, English setter. He is approxately 55 lbs and still growing. The transmitter unit for the 825 is larger than the one that comes with the 425. I have small hands for a woman and the 425 was too small to handle comfortably, the 825 also includes a clip so that the transmitter is not constantly swinging by the lanyard. The range is also consistly better. I prefer to use the tone or vibration in the house but it took the 825 to transmit to the second floor. A nick on the side button for tone is a sufficient reminder not to wrestle the cat.. As to the static charge, I am yet to need it greater than "1" in the field.
September 23, 2015