Emtec EKCOWI300

Overview
Emtec's drivers note the chip used as RTL8709.
 * This would seem to be another name for RTL8192U (RTL81xxSU is aka RTL8712) -
 * the USB ID is noted in the Linux driver for r8192u_usb which handles those devices.
 * It is presumed to be using RTL8192U + RTL8256...

Based on the dongle's appearance, Edimax is the presumed manufacturer.

Links of Interest

 * Drivers on Emtec's site
 * Appears to have a 0bda:8709 USB ID