1. Number of keys. Besides 101 and 104 keys, there are 60 keys and 78 keys for programmable keyboard. It should be said that there is no standard, according to the needs of developers to determine the number of keyboards.
2. Arrangement of keyboards. The alphabetical arrangement of programmable keyboards is not as fixed as that of conventional keyboards, which can reflect more individualization and specialization.
3. Definition of keys. The programmable keyboard can redefine each key several times. It can be defined as text, letters or an instruction. Each keyboard will have a corresponding programming program, easy to learn.