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I've seen this knife on YouTube. It vibrate at ultrasound frequency that makes it sharper than the blade really is and the ingredients don't stick to it, or so they claim. If it really does perform as demonstrated, it's pretty cool, but still overpriced.
Still, why does it need Bluetooth and firmware? Sounds like all it needs is just a vibrating motor.
If all it does is vibrate why does it need a firmware update?
Download (and print) a knife
The incredibly silly true answer is that the software industry's love for "deploy early, deploy often" has led to all embedded devices shipping with over-the-air (OTA) update support even when it barely makes sense. The earliest units of a given product run will ship with a minimally viable product build that has lots of bugs, but solid OTA.
Fun anecdote: I had a TV backlight die after about 3 years, and the root cause was a shitty embedded app that incorrectly regulated the voltage for the LED strips.
I don't think that actually answers OP's question. If all it does is vibrate then it doesn't need any software. It presumably just has a single button that turns vibration on/off and maybe cycles through vibration levels. A dumb circuit without even a single chip in it could do that.
Ah, but what if you want it to vibrate to the beat of your favorite song? Did you think about that?
Or in my ass?
No, it's not a poop knife!
I'm just guessing here, but it's probably for battery management and wireless charging, which are tricky problems you're not gonna solve with a 555. I generally trust EEs to not put MCUs where they aren't needed, so this must have been the cheapest/easiest option.
How would it vibrate without wpa3 support?
It doesn't...
But the kind of people who are impressed by a vibrating knife are also likely to be impressed by the ability to update firmware. They don't know what firmware DOES, they just know it's modern.
Don't you think it would vastly improve your stabbing experience if the knife could vibrate the Halloween theme while you're at it?
I’d want it to whistle a spooky tune like a theremin.
maybe scientists discovered new frequencies?
Yup its vibrating in the wigglehertz range.
Found it: https://seattleultrasonics.com/products/c-200-ultrasonic-8-chefs-knife
452€ 🫠
Noodle-armed motherfuckers could only manage 30 lbs of force with their arms?
So you’re saying it’s ideal for murder because it brings home less damning evidence?
"Hmm, the stab wounds show that this guy was stabbed by an ultrasonic vibrating knife!"
"Really? Those must be rare, what can they sell, maybe a dozen of those per year?"