The difference between different chair armrests

Generally speaking, the ordinary chairs on the market are installed in a fixed non-movable chair armrests, the price will be more affordable, if you want to make the chair's functions become more, the product to do more high-end, you can do to change the chair armrests, including the upgrading of the chair armrests, in general, the chair armrests are divided into 1D, 2D, 3D, 4D, 5D, 6D, etc., according to the number of superimposed, the armrests of the function is also gradually increased!Ordinary chair armrests are fixed track, there is no way to adjust; 1D armrests can hold down the button next to the up and down a little; 2D chair armrests can be up and down and to the left and right to rotate a certain angle; 3D chair armrests can be up and down, left and right rotating, front and back movement; 4D armrests can be up and down, left and right rotating, the armrest surface can be moved back and forth plus left and right;The 5D armrest is more than the front of the armrest can be 30 degrees head up function; 6D armrest is 360 degrees can be rotated.