What Yamaha has to say:
This sustain pedal offers the same feel as the pedal on an acoustic piano. It features a rubber underside that prevents it from slipping when used in piano/keyboard performances, allowing the performer to immerse themselves in playing.
It is compatible with assignable switch functions, allowing the player to call up the desired function or setting just by depressing the pedal. This one pedal can broaden the range of any performance.