DVB-S/S2 USB box manufactured by TeVii
Product page: http://tevii.com/product_s650.html.
Experimental support under Linux exists, see S2API.
The DVB-S (SDTV) part works out of the box since kernel 2.6.29 and VDR 1.6.0, as soon as the firmware file is in /lib/firmware.
To get the firmware file, download the linuxdriver_0815 package from TeVii, unrar it and copy the dvb-usb-s650.fw firmware file to /lib/firmware/dvb-usb-dw2104.fw:
wget http://tevii.com/Tevii_linuxdriver_0815.rar unrar e Tevii_linuxdriver_0815.rar sudo cp -p dvb-usb-s650.fw /lib/firmware/dvb-usb-dw2104.fw
Along with several other DVB firmwares it is also available in a 7-zip file: 728KiB download.