You have to fold the tabs in and the plastic clicks in place. They?re amazing! Headphone Impedance:Headphones with lower impedance ratings offer higher volumes at the same level of input, but they need heavier drivers to compensate for the low impedance or risk sounding muddy and distorted. The bag is a Hazard 4 Plan B sling. That leaves after about a day of wearing. It would not shutdown no matter what I did. Going to contact Amazon Customer Service regarding this but hopefully the seller will see this post and respond and we can work things out. Hope this helps. My only wish is that the divider between the left and right compartments were painted white. You can sort of work out some of the short falls by using a normal key board to compare against and work out some of the flaws.