TP-LINK TL-WR841ND v5.x

300Mbps Wireless N Router Support page

The FCC ID is not valid.

Appears to be a AR7240 + AR9283 (source, source2, source3, source4 - table) device.

The default SSID is 'TP-LINK_XXXXXX' where 'XXXXXX' is the last three octets of the wireless interface MAC address (uppercase letters).

On the DD-WRT forums On the OpenWrt Wiki

The power supply included with the unit is a Leader Electronics MU08-6090085-A1 (9V, 850mA). ID/OD/Len measurements are approximate.