Well, I don't want to spoil things, but I predict that it's not permanent.
Home appliances are throttled to about 10-15 Joule of energy. To destroy a follicle, coagulate it, it needs to be heated up to about 85 degrees Celsius for very short burst. If you do the math, the energy required to heat up cm2 is somewhere between 50-100 Joule per cm2. Most professional devices generate around 70 Joules.
The energy burst is controlled by huge caps, which discharge good amounts of energy, or joules. To generate such energy, it needs to be cooled. That's why these machines are so big.
So the science will predict that it's not going to be permanent.
But, there is some result:
When you hit a follicle with a burst of intense light, say around 10 joule cm2, the energy will not coagulate the follicle.The follicle goes into a state of semi-sleep due to limited trauma. The follicle is simply shocked, and drops the hair. This means that hairs will stay away somewhat longer than if you pluck them. But they will return, around 3 months max.
Here is my caution against these devices:
They can work against you if you decide at a later stage to go to a salon for proper treatment. The more limited trauma you inflict on a follicle, more it will be strengthened by the body. So when you do get professional treatment, it might take longer to remove them because of adaptation of the surrounding structure. They might even grow in different directions, making it very difficult to treat with electrolysis.
Sure, these are good devices for the body. Legs, arms. It replaces epilators, and that is what they are designed to do. But if you truly want permanent removal, please don't place your hope into such a tiny device... especially not on the face.
Think for a moment: it requires 3 electrolysis sessions for 1 hair to be removed permanently. The amount of heat generated reaches near boiling levels. That's why it's painful. That's why it's permanent.