As the name implies, the crystal wireless controller shell comes with the new D-Pad and LED kit set to light up all the controller buttons.
The XCM D-Pad has been redesigned and optimized as illustrated HERE. The new XCM wireless controller shell uses a much larger D-Pad with more room to allow movement when using it.
This helps ensure you don't accidentally hit another direction on the D-Pad while trying to access something else... for example, when switching weapons on most first-person shooters.
They have also made available some related guides as follows:
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