Bluetooth headset revenues will grow 17% in 2021, driven by TWS headsets but also banded headsets. In 2020 growth slowed due to the COVID-19 pandemic, but the BT HS market remains a fast-growing industry. Mono headsets are in steep double-digit decline. Revenue growth is fastest in the stereo high- and mid-tier segments, but the ultra-low segment is also growing fast. The in-ear segment (tethered and TWS) has grown past banded and takes most revenues in 2021.