Question about Sennheiser BT T100

Yes, but since your Teufel headphones only have bluetooth 4.0 (no aptx, no aac), there may be a delay between the picture and sound when watching films or playing games. Music is not a problem. I recommend a cable or then a new headphone with Bluetooth 5 and or "Aptx LL" codec. This Bluetooth transmitter is optimised for new headphones (and BT codecs).

Probably so. However, the part does not work for me with 2 headphones connected at the same time. As soon as I want to connect/pair the second one, it kicks the first one out again. I advise against buying it.