Sennheiser BT T100 Audio 508258 Transmitter, Black,

It delivers low latency and uncompromising audio transmission that is perfectly synchronized with on-screen actions for a flawless viewing experience. It's easy to use, with a dedicated Bluetooth pairing button that also has an LED light. You can choose between a stereo mini (analog) or optical digital connection. It can wirelessly connect to up to two Bluetooth headphones or earphones simultaneously. (aptX LL is not supported when connected simultaneously.) Supported codecs: SBC, aptX, aptX-LL (AAC is not supported)