Those who want to buy this keyboard for its price, it is perfect.
(The RGB is not so bright to the point where you want to break the keyboard and the mouse)

For the keyboard:
I use it daily for Minecraft speedrun, Fortnite, call of duty and it hasn't had any issues.
F1-12 work perfectly if you want to use them for speedrun.
The backspace sticks a little (for me) but for its price, it is perfect.
For the mouse:
I have no complaints (it is a bit strange until you get used to it, but it is perfect for its price, I repeat).
For the headphones:
Good sound for its price.
Also, I can say it is loud.
As for the set:
Guys, if you want it for the keyboard, it is a bit to very noisy (and the mouse too).
The headphones are good, they have a sound adjustment button (increase and decrease).
It connects via USB without any problem (I have also connected it to a laptop).
SO YES, GET IT IF YOU WANT A SET UNDER 20€

Compared to cheap office sets or low-quality peripherals, it pleasantly surprised us.
Especially the mouse, which is also the most important for PC gaming, has a very good DPI and a nice "click".
The keyboard is definitely cheaper and it shows, but so far it has been responding perfectly and doesn't have a bad feel.
The mousepad is a bit small, but not too small, and it is of good quality.
The headphones are comparable to others sold for 10-15 euros on their own, so they also have good value.
The keyboard lights up in static red-blue-green and the only option is to turn it off.
The mouse changes colors on its own, about 7-8 colors, and there is no option for other effects or to turn it off.
It is perfect for children, economical, beautiful, and if you spill liquids on it, you can just throw it away and get another one.