FREQUENTLY ASKED QUESTIONS
The actual vibrations are not audible. What’s more, the knives pulsates at a frequency about 30,000 Hz and higher, which should already be ultrasound and thus inaudible for the human ear. But you can hear a soft wind. It is hard to describe in words, but as the knife moves 30,000 times a second and more, you can hear a soft blowing/wind due to the air friction.
No, the knife vibrations are not visible. It is such a small and above all rapid movement that the eye cannot perceive it. However, the knife is equipped with a small siren, so the start of cutting, the end of cutting and other functions are indicated by a beeping noise. Thus, you know what the knife is currently doing.
We definitely do not recommend touching the knife when it is on. It is very sharp and the ultrasonic technology increases the cutting properties even more. If you asking from a purely scientific point of view whether the vibrations can be felt when touching the knife, the answer is yes. You can feel the friction of the blade on the skin. Friction creates heat, which is another reason why we do not recommend touching the knife when it is turned on.