This was all tested out on an Android Pixel phone running android 8.1.0 The headphones were provided to me by the manufacturer so I could test and then review them.
TL;DR - Solid everyday use headphones, comfortable to wear, decent sound, and decent features. This is especially true considering the price.
Sound: They sounded good, the volume never got overpowering and I never heard any serious distortion. Things were decently balanced across the tonal range, (e.g. no distorted bass due to bad EQing by the factory.) Tried Rap, Rock, Metal, Folk, Bluegrass, RnB, Jungle, Dubstep, a variety of other EDM and Top40. Everything sounded decent, at a good volume level without distortion. Occasionally on very complicated pieces (lots of instruments and midrange vocals) it may get a little muddy, but this was the exception.
The headphones also block out a lot of the ambient sound and environmental noise. I think this was helped by the snug fit. Regardless, it meant that the music I was listening to didn't get overwhelmed by outside noise and sounded good even when not at full blast. This helped me keep the volume levels lower and everything sound crisper.
Fit/Comfort: They fit comfortably on my large head (wear a size 8 fitted ballcap), over the ears. They fit snugly enough to stay on my head while moving around, but not too tight. There was not much weight to them which was great for long listening sessions.
While wearing my glasses as well, the headphones still fit comfortably. They don't pinch my ears or drive the handles of my glasses into my skull, no headaches!
I will say after a few hours of wearing them, they will get a bit of sweat on them. Easy enough to wipe off.
Use: The bluetooth synced up without issue, and I got every bit of the 33ft range with good signal, and clear sound.
Charging was simple, uses the same USB cable as a ton of android phones and other devices so losing the cord is not a huge problem.
The battery life was pretty good, I got every bit of 4-5 hours on my long listening sessions before the battery was empty. It did a good job of holding a charge. Left at 50% charge, a week later it was still sitting right there, and that listening session it still drained at its' normal pace so overall I still got about 4.5 hours or so off the original charge.
They fold up pretty easily, making them small enough to tuck into a purse or backpack for travel. They are springy enough to survive getting a little squished in the bag.
Controls on the ear piece are pretty straightforward. They have little raised bumps on them so you can figure out where your finger is without having to take them off and look. The buttons click easy and are responsive over the bluetooth.
Mic: I did try this out on a few phonecalls. The mic is handy, but it is a bit quiet. This is primarily due to the fact it doesn't face your mouth/stick out in front of your face. Nice when you get a quick call and you happen to be listening to music/using the headphones. The controls on the earpiece are easy to use and let you go straight back to listening to whatever once the call is over. Probably not as good for a work conference call where people need to clearly hear you at a loud volume level.