If your unit is rechargeable, a light indicator will show the charging status (typically red for charging, off or green when full).
Most Pro Shiatsu massagers feature a standard 4-button or 6-button control panel: Mastering Your Shiatsu Neck and Shoulder Massager pro shiatsu portable massager instruction manual
Plug the AC adapter into a standard 110-240V wall outlet. If using in a vehicle, connect the car adapter to the cigarette lighter (use only when parked). If your unit is rechargeable, a light indicator