Sitecom WLR-8100

Wi-Fi Router X8 AC1750 Product page

Sitecom releases 802.11ac product range - Sitecom press release from June 2013

Appears to be using an EtronTech EJ168A USB 3.0 controller

Per snk on the OpenWrt Forums, this device is using QCA9880-2R4E (presumed to be a QCA9880v2).