Bluetooth 5.4 Transmitter Receiver 2 IN 1 Wireless Audio 3.5mm Jack Aux Adapter. Bluetooth 4K 2K HDMI to HDMI Optical SPDIF 3.5mm Audio Extractor Converter New. Hands-Free Calling & NaigationThere is a built-in microphone for hands-free calling, and one MFB button to answer / hang up / reject / redial calls.
eBay