Sennheiser ADAPT 360 - Volume Control and Dongle Information; Volume Button Operations; Dongle Overview and LED Indicators

Volume button Press Function
Increases/decreases the
volume
(press or press and hold)
Requests remaining battery
power
(press both buttons)
Enables/disables voice
prompts
(press both buttons)
Overview of the dongle
BTD 800 USB
BTD 800 USB-C
Overview of the dongle LED indications