Features: 1.APPLICATIONS: The Bobbin winder is used to hold a variety of domestic and industrial spools, both metal and plastic types. Suitable for metal cores, plastic cores for Viking cores. 2.EASY WINDING: The automatic bobbin winding system allows for quick and easy bobbin loading. The easy setup with the bobbin winder allows winding in seconds. 3.COMPACT AND PORTABLE DESIGN: The bobbin winder and bobbin winder spools can be easily folded and stored inside the bobbin winder box unit for easy carrying and storage. 4.BATTERY POWERED: The Electrical bobbin winder is powered by 3 AA batteries for ease of use and stable performance. 5.UTILITY TOOL: The Electric automatic bobbin winder is suitable for multiple sewing machines and is a versatile tool for sewing enthusiasts. specification:Item Type: Compact Electrical Bobbin Winder Material: Plastic Product Size: Approx. 14 x 8 x 9cm / 5.51 x 3.15 x 3.54in (Manual Measurement, There Will Be 2 to 3cm Error) Battery Type: AA Batteries Battery Quantity: 3 Sections (This Product Does Not Contain Batteries) PackageList:1 x CompactElectricalBobbinWinder 1 xUser Manual NoteManual Measurement, There Will Be 2 to 3cm Error