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In addition to pure keyboards, there are keyboard + mouse sets on the modern market. Usually, these are wireless devices with a radio channel connection (see "Connection type"), but there are also wired sets. Anyway, buying a set may be more convenient than buying each item separately: for example, when connected via radio, the keyboard and mouse from one set will use one adapter to work. On the other hand, a complete mouse may not be suitable, and sometimes it's easier to choose a "rodent" separately.

Traditional keyboards are divided into three main varieties — full-size, compact and ultra-compact. The main difference between them is that full-size models have a Numpad — an additional block with numeric keys and arithmetic signs. Compact models, respectively, do not have a numpad, and in ultra-compact models, the arrow block is either completely absent or located under the Enter key in the form of very small keys.

And full-size, and compact, and ultra-compact keyboards can have different types of layouts. At the same time, the arrangement of letters and numbers above the letters in all types of layouts is the same, the differences are in the shape and position of additional keys (special characters like backslash, system control, modifiers like Shift and Alt, etc.). Here are the most popular options:

— ANSI. The "American" layout format, the distinguishing features of which are, in particular, the same width of both Shift keys, the same labeling and assignment of the Alt keys, the single-row Enter key and the backslash located above it (which is often made slightly longer than the standard key).

— ISO. "European" layout format. The Enter key occupies two rows, while at the top it is slightly longer than at the bottom; the left Shift is shorter than the right one, there is a...backslash next to it; next to the bottom of the Enter may be a second backslash or other special character key; the right Alt is designated as Alt Gr and is intended for entering additional characters in European languages.

— K.S. The "Korean" keyboard layout provides a double-row Enter, as in the ISO described above, however, in this case, the lower part of the Enter is made longer, and not the upper one. The backslash is above Enter, next to Backspace, and Backspace itself is the same length as standard keys (that is, noticeably shorter than in other layouts).

— JIS. Keyboards with a "Japanese" layout have a double-row Enter with an increased length of the upper half — like the ISO described above. However, in this case, the backslash is not located on the left side of the keyboard, but on the right, next to Enter (where an additional symbol key can be located in ISO). Additional character keys may be provided — next to Backspace (as in KS) and/or to the left of the right Shift. In addition, the right Alt can be formatted as Alt Gr.

In addition to compact and full-size, there are also non-traditional keyboard formats:

— Numpad. Separately made block of numeric keys. With the help of such a device, you can, in particular, turn a compact keyboard into a full-size one. Among other things, this combination can be useful for travel: packing a Numpad separately from the keyboard is easier than finding a place for a full-sized "board". Another option for using the Numpad is to connect to a cash register, terminal, etc. to work as a calculator keyboard or in a similar capacity.

— Keypad. A specialized device in the form of a small (approximately 15 – 20 keys) keyboard under one hand; usually, it is complemented by an arm rest, and often also by side buttons for the thumb. Such devices are especially convenient for games and are mainly used in them — certain game actions can be attached to the keypad buttons (including those that are usually implemented through the menu or a key combination on a standard keyboard). The keypad can both complement the main keyboard and serve as a completely separate game pad.

— Non-standard. Non-standard format keyboards that do not belong to any of the varieties described above. The specific design and use of such devices may vary. So, these can be game models in the form of the left half of a standard keyboard (this part is mainly used in games); ultra-compact models for tablets (see "In the direction"); keyboards for TVs, supplemented with special buttons and designed to be held in two hands in the manner of a gamepad, etc.

The colour of the Cyrillic letters printed on the keyboard.

This colour is usually chosen so that the letters are clearly visible. This point does not affect the functionality of the keyboard, and the choice in this case depends mainly on personal preferences. However, there is also a practical point: for inexperienced users who have not mastered touch typing, it is desirable that the letters stand out as much as possible against the background of the keys.

Transparent letters are a separate case — they are used in keyboards equipped with a backlight (see below), due to which such characters, when the backlight is on, are visible even in the dark.

The presence in the keyboard of a special game mode.

This function is found exclusively in models of the corresponding specialization (see "Intended use"). Enabling Game Mode disables some of the keys and keyboard shortcuts used by the system, such as the Windows Start menu button and the context menu button. Thanks to this, you do not have to worry that an accidental key press will call a system function and interrupt the game.

In many models, you can customize a specific set of keys that are deactivated in the game mode.

The presence of additional effects in the backlight provided in the keyboard (see above). For models with the backlight synchronization function, this item indicates the synchronization technology.

Additional backlight effects can be different: multi-coloured backlighting of individual keyboard zones, smooth “flowing” of one colour into another, response to system or game events, etc.; specific features should be clarified for each model separately. As for synchronization, it allows you to coordinate the backlighting of various system components — keyboards, case mice, graphics cards, etc.; this opportunity is especially appreciated by the owners of high-end gaming stations. Coordination requires that all highlighted components support the same technology; usually, each manufacturer has its own — Aura Sync for Asus, RGB Fusion for Gigabyte, etc.

Keyboards made in a Skeleton case.

The main difference between such cases and the classical ones is that the mechanism of each key is not hidden at the base of the keyboard, but, on the contrary, rises somewhat above it. Due to this, the keys can be easily removed and put back into place, which makes it much easier to clean from dust and dirt. And in gaming keyboards of this type, the kit often includes interchangeable buttons that differ in colour and texture from the main ones. Actually, almost all models with this feature are specifically gaming (see "By Direction").

The principle of operation of the mouse supplied with the keyboard.

— Optical. The principle of operation of optical mice is to use an LED that illuminates the surface under the mouse, and a photo sensor that “observes” the illuminated surface and tracks movements. This technology is quite reliable and inexpensive; at the same time, traditional optical mice, although they are inferior to laser and BlueTrack mice in terms of accuracy, however, they work more than satisfactorily on standard surfaces (rodent pad, tabletop). In addition, various specific technologies can be used in the design to increase accuracy and allow working on unusual surfaces.

— Laser. The development of the idea of the optical mice described above: the principle of operation is the same, however, for illumination, in accordance with the name, a more intense light source is used — a laser. Thanks to this, laser mice are more accurate and behave better in non-standard conditions — on fleecy, polished surfaces, etc. — however, they are more expensive.

— BlueTrack. Microsoft proprietary technology (however, used by other manufacturers), which provides a number of improvements for optical mice (see above): a bright blue LED (hence the name), high-quality coated lenses, a large sensor, etc. Thanks to this, such mice are significantly superior to conventional optical mice both in accuracy and in the variety of surfaces with which they are compa...tible. The disadvantage of this traditional option is the high cost.

The number of buttons in the design of the mouse, which is included in the kit. The minimum number of such buttons to work in most modern operating systems is two, and a larger number, usually, means that the mouse has additional functions. For example, the third key can be used to change the resolution of the mouse sensor on the fly, for the function of double or triple click (the latter is used in games for shooting in short bursts); a pair of buttons on the side under the thumb is usually configured for the "back" and "forward" functions in the browser, etc. And in gaming mice, there can be more than a dozen additional buttons for the fastest access to various game functions.

The number of scroll wheels provided in the design of the complete mouse. The most traditional option is considered to be one wheel that provides movement up and down (and in some mice — in all directions), but sometimes it can be supplemented with a second one — for horizontal scrolling. The latter is useful when working with large-format materials — for example, in the field of design or printing.