This is of utilitarian interest, definitely not a replacement for a proper headphone amplifier. It is the SYBA external USB Stereo Sound Adapter going for $5.26 at amazon.com. This is however an ADD-ON item, so you must needs place a $25+ order in order to buy it.
Any combination of eligible products and quantities works. The shopping cart will very promptly notify you whether your order qualifies. The restriction applies to all shoppers, especially Prime members, since the Add-On program was created to counter Amazon paying for free 2-day shipping on $1 items 🙂
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