Sena Bluetooth EXPAND v1.0 User's Guide - Manual (Page 6)

EXPAND
6
USB Power & Data Cable
Speaker Pads
Microphone Windscreen
3. GETTING STARTED
3.1 Wearing the Sena Expand
Proper fit on your ear and head is important both for
comfort and optimal noise-reduction performance.
The speaker with microphone should be placed
on the left ear. Then you can place earhooks over
ears and pull the microphone in toward your lips as
positioning the microphone with its talk side facing in
as shown below.