The PHOENIX SD2VITA refers to an SD2VITA adapter, typically a version 3.0 or 6.0
, designed to allow you to use standard microSD cards (TF cards) with your PlayStation Vita instead of the expensive proprietary Sony memory cards. 
Here's a breakdown of what that means
In summary, PHOENIX SD2VITA refers to a type of SD2Vita adapter, likely a version 3.0 or 6.0, used to enhance your PlayStation Vita's storage and potentially performance by allowing you to use standard microSD cards instead of expensive proprietary ones.