2 POWER SUPPLY: Our bobbin winder can be plugged into two 1.5V AA batteries or used with a USB cable plugged into a Type C port via a DC5V power adapter. Please note that only non rechargeable batteries can be used. 2 BOBBIN FIXING CONFIGURATIONS: This sewing supply has 2 bobbin fixing configurations, you can use it to wind industrial sewing machine bobbins can be used to wind home sewing machine bobbins, and it is complete portability. You can easily take it anywhere you go. HIGH SPEED MOTOR: With 7.2W of power, this bobbin winder can wind thread quickly and steadily. All you need to do is follow the instructions to place the bobbin and thread in the right position and press the ON button. CONVENIENT DESIGN: This bobbin winder machine also comes with built-in storage space. It has a lock and hidden handle to further protect against dust, and it is also designed with bottom suction cups to make winding more stable. WE CARE ABOUT YOU: It is always our goal to provide excellent service to every customer. if you encounter any difficulties during the shopping process, please feel free to contact us and we will reply within 24 hours on working days. Gugxiom is looking forward to doing better with you.