---
title: 'This Tech Knife is Insane!'
source: 'https://youtube.com/watch?v=PTd98UnJnnU'
video_id: 'PTd98UnJnnU'
date: 2026-08-27
duration_sec: 113
channel: 'Marques Brownlee'
---

# This Tech Knife is Insane!

> Source: [This Tech Knife is Insane!](https://youtube.com/watch?v=PTd98UnJnnU)

## Summary

The video tests a battery-powered ultrasonic chef's knife that vibrates at 30,000 times per second, comparing its cutting performance with the vibration on and off. The creator demonstrates the knife's effect on various foods, noting that it makes cutting easier, similar to a pedal-assist e-bike versus a regular bike.

### Key Points

- **Introduction to the ultrasonic knife** [00:04] — The world's first ultrasonic chef's knife is battery-powered and sits on a magnetic wireless charger. The handle sends shock waves through the blade at 30,000 times per second when a button is held.
- **Demonstration of vibration** [00:30] — The vibration is not felt by the hand, but is visible when water is placed on the blade, causing it to vibrate visibly.
- **Cutting without ultrasonic** [01:00] — The knife cuts reasonably well even without the ultrasonic feature, despite not being serrated.
- **Cutting with ultrasonic** [01:28] — With ultrasonic on, cutting a grape feels like magic, making the process easier. The creator compares it to a pedal-assist e-bike versus a regular bike.
- **Sound effects** [01:41] — The ultrasonic knife produces crazy sound effects, which might be a major appeal for users.

### Conclusion

The ultrasonic chef's knife delivers a noticeable improvement in cutting ease, though the dramatic sound effects may be its most entertaining feature. It's a novel gadget that enhances, rather than revolutionizes, the cutting experience.

## Transcript

This is the world's first ultrasonic chef's knife, and I had to try it. So, I got my hands on it. This is the knife, and it's actually sitting on a magnetic wireless charger because it's battery-powered. So, I get the idea. You
hold down this button, and the handle will send shock waves through the knife blade at 30,000 times per second as I hold it. And then you can see it's working when this light is on. But, I'm holding it
right now, and I can't feel anything. I actually can kind of really good visual. Ready? Just going to take some water, take some water, put it on the blade.
So, let's see about cutting stuff. I'm going to try cutting first without going to try cutting first without turning it on.
Pretty reasonable. Okay. Let's try it on. impressive, especially cuz this is not a bread knife. It's not serrated. So, no
bread knife. It's not serrated. So, no ultrasonic. Okay. I wouldn't be mad at that, but let's try ultrasonic now.
Okay. Okay. Check it out. This is a grape. it feels like maybe it should be like magic. But, the way they describe it is
it's like a pedal-assist e-bike versus a regular bike. Just makes it a little easier, but maybe you're more after the sound effects cuz you're more after the sound effects cuz that's crazy.