Number of stitches
The number of stitches that the sewing machine can sew. The larger this number, the more extensive the possibilities of this model and the wider the choice of the user. However, a specific range of supported stitches needs to be specified separately.
The least options — mostly up to 25 — are provided in electromechanical machines, as well as specialized devices like overlockers and coverlocks (see "Type"). In computerized devices, the number of stitches can be in the tens, and some also allow you to download additional options from your computer.
Max. stitch width
The maximum stitch width performed by the sewing machine.
Most modern sewing machines can work not only with the simplest longitudinal seam (when the needle punctures go strictly one after the other) but also with seams that overlap a certain width — for example, zigzag and various decorative ones. And in overlockers, such features are generally available by definition.
The larger the maximum stitch width, the wider the possibilities of the machine to work with specific types of seams (ceteris paribus). An indicator up to 5 mm is typical mainly for entry-level devices, 5 – 7 mm — medium, and 7 mm or more — advanced.
Power consumption
The power consumed by the machine during operation. Usually, the maximum power value is indicated in the characteristics.
Most of the electricity supplied to the machine is consumed by the engine, so this indicator primarily describes the power of the engine. The higher this power, the faster the machine can work and the better it is suitable for working with dense fabrics. However, there is no strict dependence here, much also depends on the general specialization of the unit.
Cover
The type of cover supplied with the sewing machine.
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Soft. A soft fabric cover protects the machine mainly from dust and dirt and provides almost no protection from bumps and collisions. At the same time, having removed such a cover for the duration of work, it can be folded compactly.
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Hard. A cover in the form of a hard cover put on from above or a case in which the machine fits. Such a cover is rather bulky, it cannot be folded like a soft one; on the other hand, it protects the machine well both from dirt and from collisions and contact with solid objects.
