Specifications

. Higher resolution 2. Higher accuracy 3. The interface effect is stronger

Special remind: (3 d, 4 d and 6 d) the difference between
3 d version: three keyboard for ordinary standard, which has left, right, key, in the general office, home enough!
4 d version: on the 3 d version of the function, added a cursor control keys, which is usually variable key said.
6 d: on 4 d version of the function, increases the forward and backward key, also is usually said side button.