4. USB AC Charger
Before use, connect the head unit to a charger to charge it fully.
1. Insert the USB plug of the charging cable into the charger and the other small plug into the
headset.
2. In charging, the red lamp of the headset will be on; after charging is over, it will be off.
IV. Install the Main Unit onto the Helmet:
Steps:
1. On the left of the helmet, find a proper location to fix the clamp.
