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TP-LINK TL-WR340 v2.2
Same as the TL-WR340GD aside from the antenna configuration. The TL-WR340G has an integral antenna. The TL-WR340GD has a RP-SMA connector.
There are multiple revisions of this device. I don't know what the differences between v1 and v2 (and others) are. v3 switches to an Atheros AR8236 switch (see below DD-WRT forums thread).
00:27:19 OUI is from a v2.22 device.
On the DD-WRT forums (part details, links to high-res images of v3 via Dropbox)