Tiny Kana-SD MP3 player

KanaSDThe Kana-SD doesn't look like it has any internal storage of its own, but this new MP3 player, which weighs just 30g and measures  62x47x17mm in size, does have an SD/MMC slot that supports cards up to 512MB. Yes, that big thing sticking out of the side is a USB jack (it pops out when you want to copy some songs over from a PC), but what we can't figure out is whether that metal circle dealy is part of the player's controls or not.