Buffalo WPL-05G300

PowerLine AirStation Wireless Ethernet Adapter
 * Powerlink 500AV Wireless-N Router
 * Product page

"2976398202" is silkscreened on the board in the FCC photos.

Default settings (including the SSID) are per the FCC manual.
 * The default SSID pattern is indicated to be BUFFALO-XXXXXX, where XXXXXX
 * is the last 6 digits of the unit's MAC / BSSID (upper case hex digits?).
 * Encryption is indicated to be enabled by default (except in the Asia Pacific).
 * The default SSID in bridge mode seems to be 192.168.11.100.