"Xbox Elite Wireless Controller" which can be customized small was sold from the formula in Xbox One, and there was a PS license product like "ASTRO C40 TR controller" in PS4, but there was no sale of a controller by which the back button is equipped with from the formula. But the additional parts which can add the back button in PS4 pure controller "dual shock 4" this time DUALSHOCKR4 back button attachment was an announcement!

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