How about the little black button on the edge of the apple tablet?
The key next to the volume keys, currently has two functions, one is the horizontal and vertical lock screen, a mute mode, these two functions are not achieve together, must be in the general settings - set.
Volume! Because there are only two buttons on the edge!
The small black button on the side of the apple tablet can set the mute key or lock the screen to rotate".Set the operation to:The first step: click the desktop settings icon.The second step: open "universal"".The third step: if you want to set as mute key, in the side switch for an item, choose mute.