TRENDnet TEW-639GR 3.0R

"WRT-391R Rev. UB" is silkscreened on the board in the FCC photos.

The router has three antennas despite the lack of three RX/TX chains. Two (left and middle on the FCC photos) appear to be used in a switched diversity configuration.

The AC adapter pictured in the FCC photos is a Bestec EA0061WAA.

Specs
Platform Serial Num. = ? FCC ID = XU8TEW639GRV3 Industry Canada ID = ? CPU Type = Realtek RTL8198 MIPS Rev = ? CPU Speed = ? Bus = ? Flash Type = ? Flash Chip = ? Flash Size = ? Max Firmware Size = ? RAM Size = ? RAM Chip = ? nvram Size = ? ETH chip1 = Realtek RTL8198 Switch = Realtek RTL8198 Port-based vlan = ? 802.1q vlan = ? Ethernet Port Count = 1-WAN 4-10/100/1000-LAN Wired Standard = IEEE 802.3/3u/3ab Ethernet interface OUI = none specified boot_wait = ? bootloader = U-Boot Flash Card Socket/Type = No SD/MMC Mod Support = No Expansion IF types = none specified PoE = No Power = 12 VDC, 0.5 A Connector type/size = Barrel plug LEDs/Color = ? Size = ? USB = MOD to Add? Serial Port = Yes JTAG Port = No Supported by TJTAG/Version = ? Special Features = ? Radio Wireless Radio = ? WLAN DSP processor = Realtek RTL8192CE Wireless interface OUI = none specified Antenna Connector Type = U.FL MIMO status = 2x2:2 Wireless Standard = IEEE 802.11b/g/n 802.11n = up to 300 Mbps 802.11g = 6, 9, 12, 18, 24, 36, 48, 54 Mbps 802.11b = 1, 2, 5.5, 11 Mbps WiFi Operating Frequency = 2.4 GHz Radio cor_rev = ? Radio Capabilities = ? Other Default IP address = 192.168.10.1 Default login user = admin Default login password = blank Default SSID = ? OEM = U-MEDIA WRT-391R 3rd Party Firmware Support = ?