Linksys WRE54G v2

Wireless-G Range Expander , Support page (UK)

OEM Gemtek WACM-117G v02 (WACM-117G_V02)

WRE54G v2.0 serial numbers may start with MGB1.

Device is on the DD-WRT known incompatible devices list. Internal pics are viewable here on the DD-WRT forums.

Per the FCC photos, the device does not use a barrel for power.