argi73,
I think geostar was referring to the eBay auction when it saids "free big". I think it should be "free bag" instead.
All three player description mentions "AVI" so it seems like a Rockchip based player and all three look very similiar. It's hard to say exactly was what the manufacturers generally do is buy parts from various manufacturers (chip boards, casing, etc) and assemble them together themselves. There might be a slight difference in the firmware, it's firmware or the chipset. Even though the casing looks the same.
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