TRENDnet TEW-639GR 2.0R

"WRT-391L Rev. UB" is silkscreened on the board.

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

The power adapter included with the router is a Leader Electronics M12-4120100-A1.

Specs
Platform Serial Num. = ? FCC ID = XU8TEW639GR Industry Canada ID = ? CPU Type = Ralink RT3052 MIPS Rev = ? CPU Speed = 384 MHz Bus = ? Flash Type = SPI Flash Chip = Macronix MX25L3205DMI-12G Flash Size = 4 MB Max Firmware Size = ? RAM Size = 32 MB RAM Chip = Winbond W9825G6EH-6 nvram Size = ? ETH chip1 = Ralink RT3052 Switch = Atheros AR8316 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 = 00:14:D1 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, 1 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 = Ralink RT3052 Wireless interface OUI = 00:14:D1 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 = TRENDnet OEM = U-MEDIA WRT-391L 3rd Party Firmware Support = ?