Linksys WRT55AG v2

WRT55AG v2 serial numbers appear to start with MDJ1.

"WRTA-119AG_V01", "109-102-4500", and a date code of 0449 is silkscreened on one particular WRT55AGv2's board.

This device may use U-NII-2 channels but does not implement DFS since it predates the FCC requirements.

Additional external links

 * On the DD-WRT Wiki's Supported Devices Table (though, it's unsupported)

Probable used PSU(s)
The power supply included with the device is a (Linksys branded, model AD 5/2.5C) Leader Electronics MT15-5050250-A1.