This headphones are pretty good, but not amazing enough to deserve 5 stars. Also I've got to remember that they're only around £20.
So here's some of the features of the headphones and the review:

SOUND QUALITY:
The sound quality is averege, it's not going to blow you away neither is it so bad that you can't bear these. They're just okey. The low frequencies are actually pretty good, I quite ejoyed the clear bass.

USABILITY:
It's super easy to sync them with your phone no problems there. I like that the power button is a slidy one not push one, makes it more obvious when the headphones are on.
One of the bad things about the usability is the bottons on the right side, there is no way to tell the difference by just feel. You have to take them off or memorize them which botton was which.

FEATURES:
You can plug a micro SD card in with your music on and listen to your music straight from the headphones. The music player is built in! AMAZING!
This is a really cool feature.
FM Radio. There is Fm radio built in, just long press the play/M button and it turns the FM radio on. You can listen to radio without having any other devices.
Also you can use the headphones plugged in as well if wanted. A jack to jack cable is provided for that.

Overall good decent headphones, they look better than they sound. If you're main aim is to get something that looks good and is cheap, this is the one and only option. It you'te looking for something good and cheap then this is the best option for you. They're not professional but definitely a good product for the price.