A car manufacture came out with noise cancellation by using opposing frequencies to eliminate sound. They should implement that into when your holding the button down grinding stuff. That should quite things down.
The noise is a given since it's a "Grinder" lol. It's a bad ass little gadget made for serious performance, not what you'll find in a pen.
Trust me, if Yaniv was able to fit this motor in a pen without compromising performance he would've done it. It's just not possible to get the type of result we saw in the video from a puny pen.
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