They work and are cheap.
But they are far from nice.
I got two pairs of these because they are pretty cheap and I thought they were a bargain. First off there was plastic on the connector was all up the shaft making it hard push in. Then after I cleaned the plastic off the connector crackles in the jack to the point where only one side worked. After a bit of tweaking it does work but I think the actual connector is ever so slightly smaller than it should be.
There are two silver plates on the back of each ear phone where L and R are stamped these wobble about making noise in your ear.
See the point where the wire goes into the ear phone well that piece of plastic that keeps it snug had come undone on both pairs on both sides.
So out comes the super glue, i glued the L and R disk things to stop them rattling then i glued the wires sleeve to the earphone stalks that's 8 parts i had to glue.
They sound is pretty standard not good not bad.
Take the risk if you got super glue personally i would look at spending more on a brand name product just for the jump in build quality.