Multimedia devices with network connection (TV, media-player, XBox 360 or Blu-ray player) can easily be upgraded with WLAN. The device receives WLAN-signals & converts these in data for a network cable connection. Power is supplied via the plug power supply or alternatively via the USB (Universal Serial Bus) (e.g. at the USB (Universal Serial Bus)-connection of the television with that the client needs only power, if the TV set is also switched on).