For Bluetooth transmitter:
The transmitter is quite small - a little longer than a matchbox, but also narrower. On the top there is only a pairing button. The USB port on the TV, the small device gets its energy. The delivery is still a 3.5mm jack cable that is connected to the headphone output of the TV to pass the sound of the TV to eg Bluetooth headset. USB or jack cables are long enough.
Pairing:
Pairing is very simple: press pairing button, enable Bluetooth headset in pairing mode and wait until the blue LED on the transmitter will stop flashing. Done.
Use:
Since one did not has his sleeping partner would tear with loud TV sounds from deep sleep, I've bought bluetooth headphones. These are the Sony MDR-XB950BT (highly recommended). Unfortunately, you can not connect with the PS4 these headphones. So I've been looking for solutions to also wirelessly enjoy my PS4. And this is where the Bluetooth transmitter is used, which is connected to the TV. At a distance of about 3 meters, it sends a flawless sound - assuming, of course, also corresponding headset. And the beauty of the transmitter is that you can even run 2 headphones simultaneously.
Conclusion:
I can absolutely recommend this little device. It does exactly what it should do: clean send the TV sound. Especially for PS4 and Bluetooth headset owners is worth a look - if the night's rest must be observed in the house.