No info about GH-20F on official site
12\15, we do recommend
Seller = 1\2
Quality = 4\4
Usability = 3\4
Exterior = 3\3
Price = 0\2
We could not find model GH-20F on Gineya oficial website.
This headset is genuine and works great, but you have to be sure that it will fit your frame.