Function:1. Made of high quality plastic to ensure long life, you can use it with confidence.2. Comes with batteries so you don't need to buy batteries separately.3. Small and portable, convenient to store and carry and at the same time easy to carry.4. Professional tools for watchmakers and watch repairers save you expensive repair energy.5. A good replacement for old or damaged mechanical movements, easy to install and reliable to use.Specification:Item Type: Automatic MovementMaterial: plasticBattery model: SR621SW button battery (included)Battery capacity: 18mAhPurpose: Used to replace the movement.Package list:1 x movement1 x handle1 x button battery1 x gear