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from design and functionality, to compatibility and use, the pro 550 plus will be a great addition to your canine toolbox. – the simple, tube-shaped design makes the pro 550 plus easy to use, even with one hand. the compact construction on the pro 550 plus makes the most of available space by giving multiple functions to each button and switch. the “n” position is also used when pairing a collar to the pro 550 plus by selecting “n” and …