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I have a general question about hardware here, specifically Bluetooth 4.0. I've been looking to upgrade my little Bluetooth USB dongle from an earlier version (I think it's ~2.1) to something newer, but the speeds listed for Bluetooth 4.0 do not make sense on NewEgg / vendor sites.

http://en.wikipedia.org/wiki/Bluetooth

Version     Data rate   Maximum application throughput
Version 1.2     1 Mbit/s    0.7 Mbit/s
Version 2.0 + EDR   3 Mbit/s    2.1 Mbit/s
Version 3.0 + HS    24 Mbit/s   See Version 3.0+HS.
Version 4.0     See Version 4.0LE.

Now, I could be wrong, but I am seeing 4.0 devices listed with 3 MBit/s maximum speeds. Assuming backwards compatibility with previous editions, the maximum speed should be at least 24 Mbit/s.

http://www.newegg.com/Product/Product.aspx?Item=N82E16833320166

Interface
    USB 2.0

Bluetooth Standards
    Bluetooth 4.0

Transfer rate
    Up to 3.0Mbps

I normally enjoy Asus stuff, and have included the above as an example.

Am I just looking at the wrong products? Is there something about the spec I do not understand? Am I reading it incorrectly? Anyone have any idea what's going on here? I don't think it's a limitation of USB 2.0...

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