Sorry, I'm going to call this more B.S. than truth [Edit: At least to the over-whelming marketing B.S.... although it can work for some situations, which I will explain below]. I am trying very hard to keep an open mind, but it is not possible for this device to do everything it claims. I'll explain why.
Sound cancellation depends on directionality, distance and speed. For example, if you have points set up as follows:
A (source) ----> B1 (device mic) --> B2 (device speaker) -----> C (ear)
Sound generated at "A" will get to B1 and device will hear it. Processing very fast, in the speed it takes for sound to get from B1-->B2 in physical space, the device will emit a cancelling audio output at B2 which will mute the sound from "A", so that it will be diminished at "C" (your ear). That's how most noise cancelling headphones work. They first of all acoustically shield your ears from external noise, but on top of that they will also add a cancelling audio which is exactly the same but inverse to the external sound it is picking up by microphone to the audio generation, thereby helping to additionally mute out external noises.
You can also do it another way but this is harder.
A (sound source) ----> B1 (microphone) -----> C (your ear) <------- B2 (speaker)
If the device "B1" microphone picks up a sound and it is able to generate an inverse sound signal at "B2" speaker, depending on the distance from B1--> C and B2--> C, you can end up with a cancellation "NODE" in space where sound at "C" is muted. That is, any audio coming out of "A" and heading towards your ear "C" will overlap with the exact cancellation sound coming from B2.
In that case, the B1 microphone has to be slightly further from C as B2. Why? Because you have to account for the time for B1 microphone to process the sound, electronically transmit the signal to B2 (via Bluetooth or whatever), decode and generate the sound at B2. However, regardless of how you do it.... The physics REQUIRES that sound from A and the cancelling sound from B2 have to overlap at C. If you have sound bouncing off the walls, or there is any other indirect path or you move your ear "C" to any other point in the room, you are NOT going to get full cancellation, and in fact you may even get louder noise if you are positioned at a super-imposition of the waves rather than a cancellation of the waves.
This is not much different than simple standing waves in a string of a certain length. You have certain frequencies which will create standing waves, you have spots that are completely not moving (nodes) and you have spots that are vibrating through the full amplitude. You can even see this in tubes with speakers on one end, where you have gas flames at different heights (Kundt's tube).
Anyways, the "Muzo" can only cancel sound in the following scenario. Imagine someone is yelling in the room next to you, or outside your window, or whatever. The sound hits the window, the window or wall vibrate and therefore transmit the sound into your room. Obviously the air is not directly passing to your room. Sound energy transfers to the window/wall, which in turn vibrates, which in turn then vibrates the air in your room.
The "Muzo" would basically pick up the vibration of the window or wall, and generate a sound that is cancelling to that vibration. It could also act as an "inertial damper" in that it could have a small weight on it and actively move it so that it lessens the vibration of the window or wall. Even a free-moving pendulum could to that.... No active movement needed. It would add mass to the system, and dampening, so vibrations of the window or wall are reduced. If your window is 10x heavier, it will move 10x less in amplitude, and that in turn will move the air molecules in your room also 10x less. [Edit: I see that is one of the features of the system, so yes I believe this is possible].
As you can see, the "Muzo" would then be great for windows, and certain geometries of walls or doors. However, if you are in a crowded restaurant, you may reduce a bit of the sound bouncing off the table by dampening the table. But it will not "acoustically" be able to cancel sound from all directions, the geometry of the paths the sound is making and your ear picking up sound from all directions, is just the wrong configuration.
Same thing for home. If you are in the room that you are trying to reduce the sound from, and you put it on a wall... The Muzo may dampen sound bouncing off that wall. You will still hear the original sound coming from the source, but you may dampen the ECHO.
So..... in summary:
1. Inertial dampening with perhaps sound acoustic dampening when sound is travelling through flexible objects like windows, walls, when blocking outside sound sources.
2. Echo removal when blocking inside sound sources but dampening/cancelling echoing sound.
3. Maybe some dampening and cancellation (minimal) in restaurants.
I'd like to try an experiment.... Tape a piece of LEAD to your window and see what it sounds like before and after. I'm curious to find out how much of an effect that would have alone. Anyone want to try this and report back?
The idea is great, but the proof will be in the pudding. Let's find out how well it works. If you really want to get peace and quiet, stick in some earplugs or put on a set of noise-cancelling headphones and play nothing on them.