The Side Winder Portable Bobbin Winder is the quick and easy way to fill your bobbins on the go! Featuring compact size, this bobbin winder fits anywhere and is easy to carry on the go. It comes with a high-quality AC power cord and runs efficiently on two AA batteries. With just one button, your bobbins fill up easily without un-threading and re-threading. Specially designed to accommodate standard size bobbins with round center holes, this bobbin winder is ideal to use on all your sewing projects.