It is a simple circuit kit that includes a motor, battery case, and switch. It can be used as long as you prepare 2 AA batteries.The wire has been welded and does not need to be welded separately.Motor size: 25*20*15mmMotor speed: about 16500 rpmSwitch size: 18*12mm (without feet)Battery specifications: AA dry batteryProduct weight: about 21 gramsPlease prepare 2 AA battery yourself while using the product.Package includes: 1 piece of motor