Hello Mauro,

The headset comes with an audio cable that can be connected to a smartphone to make phone calls with the headset. You can find more detailed information on the manufacturer's website under manuals. I recommend that you briefly skim through it in order to know the functions and their limitations.

To answer your question: The USB stick which is used for wireless transmission of audio content (Logitech calls this an "Audio MixAmp" if I remember correctly). This USB stick has a 3.5mm cinch connection with which you can forward analogue audio signals to the headset via the adapter. It is important that the USB stick is supplied with power. If you have a TV with a 3.5 mm cinch headphone connection, USB connections and a corresponding 3.5 mm cinch cable, you can send the sound from your TV to the headset without any problems.

Cheers and have fun.