1、2 TYPES BOBBIN CONSTRUCTION: Bobbin winder is equipped with two types of bobbin fixing construction, which can be used to wind industrial sewing machine bobbins as well as domestic sewing machine bobbins. 2、INCLUDED ACCESSORIES: Bobbin winder is used for sewing machine bobbin winding, comes with bobbin winder and 6 extra coils, easy to operate. 3、TWO POWER SUPPLY METHODS: Portable electric winding machine is powered by USB or AA batteries(battery not included), built in storage space, case with handle, easy to carry. 4、EASY TO OPERATE: Will make the winding job easy to complete, the bobbin winder consists of a spindle for bobbin fixing, three rods for storing the bobbin, and a threaded tension disk for adjusting the tightness of the winding. 5、DURABLE: Portable electric winding machine is made of plastic and stainless steel, durable and not easy to damage, can be used for a long time.