Comparison Casio CTK-4400 vs Casio WK-240

The greater the number of keys — the wider the range of the instrument, the lower and higher notes you can take on it right during the game, without resorting to tricks like octave shift (see below). By comparison, a full size piano keyboard has 88 keys. However, in synthesizers, such an amount is rare, because. the instrument would have turned out to be too bulky and expensive, and not every musician, even a professional one, needs such an extensive range. Thus, 88-key keyboards are used primarily in high-end workstations (see "Type"). For ordinary synthesizers, the standard is 49, 61 or 76 keys ( there are also options for 73 keys) — this is usually quite enough (while the "golden mean" option is considered to be 61 keys). And small children's models can have 32 keys.

The type of battery used by the synthesizer.

Self-powered, as the name suggests, allows you to use the tool regardless of whether there are outlets nearby. Usually, replaceable batteries of a standard size are used for this. Here are the most popular sizes in modern synthesizers.

— AA batteries. Familiar to many "finger-type" batteries, the most popular modern standard size, available for sale almost everywhere. The power of such a supply, however, is relatively low, but in the case of synthesizers, this only affects the power of the built-in acoustics (see above), and this parameter is rarely a key one. So this option is very common.

— C batteries. Cylindrical batteries, similar in length to the AA described above (50 mm), but thicker — 26.2 mm in diameter, which made it possible to significantly increase power and capacity. At the same time, C elements are used relatively rarely in synthesizers — if you need a "heavy" power supply, most manufacturers prefer even more capacious and powerful D elements (see below).

— D batteries. The largest, most capacious and powerful batteries used in modern synthesizers: they are 63 mm long, about 34 mm in diameter and have a capacity of 4000 to 16000 mAh. They are used much less frequently than AA, mainly in advanced tools with high power consumption.

Note that batteries are usually not included with the synthesizer, they must be purchased separately....However, in this case, this is more of an advantage than a disadvantage: the user can choose the batteries at his discretion. And the choice is quite wide — all the described sizes are available both in the form of disposable batteries and in the form of accumulators, and both types are represented on the market by many brands that differ in quality and price.