My favorite shoe! The pieces dont line up and it is impossible to get together. I just wish it would have come in a squeeze-tube form/ or an air tight pump. You only need one power cord which is great. This UGreen 18W unit (charger AND cord) gets the job done and then some. they are not so comfortable because my feet hurts sometimes. The materials are hit or miss. I had no heel pain while wearing them. I was using a cheaper wired headset prior to this and am blown away but the improvement in sound quality. If you are looking for that hard hitting, high volume sound to get you juiced up during your gym time these wont deliver that.