The prefix is black for digital television on a white background with a USB flash drive.

white, entertainment, background, object, view, set, box, equipment, black, cable, connection, connector, technology, button, communication, device, electronic, smart, receiver, digital, electronics, panel, audio, broadcast, switch, usb, remote, stereo, drive, flash, watching, media, control, video, port, Channel, signal, component, tv, television, broadcasting, satellite, multimedia, slot, hdmi, controller, decoder, dvb t, prefix, set top box,