Linksys WRE54G v3

Wireless-G Range Expander , Support page (UK)

OEM Gemtek WACM-125G v02 (WACM-125G_V00)

WRE54G v3.0 serial numbers appear to start with MGB2.

Device is on the DD-WRT known incompatible devices list.

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