The attachment is based on the LE AUDIO transceiver firmware implemented on R496.1 QCC3084:
Receiver side UI:
Click: play pause, answer and hang up
Double click: switch to launch mode
Long press for 1s to release: Reject
Long press 3S to release: pairing
Long press 6S to release: switch machine
Launcher UI:
Double click: switch to receiving mode
Long press 3S to release: initiate broadcast mode