Most nail tools give you one speed and ask you to adjust your technique instead. Feluur works the other way around, the tool adjusts to the nail.
A dog's nail isn't uniform. The outer layer is dense and needs speed to move through efficiently; the closer you get to the quick, the softer and more sensitive it becomes. A single speed grinder forces a trade off: fast enough for thick nail, too aggressive to trust near the quick, or slow enough to feel safe, but slow through the whole nail every time.
5 speeds remove that trade off. Run higher RPM through the bulk of the nail, then drop down as you approach the sensitive zone, same tool, same pass, no swapping attachments or switching devices mid trim. That shift in control is what actually changes the experience: less pressure, less guessing, more confidence with every pass.
Paired with the diamond bit, which grinds cleanly at any of the 5 speeds without the drag or heat buildup you get from sandpaper drums, the result is a trim that adjusts to the nail in front of you, not the other way around.