Comparison A4Tech FBX50C vs A4Tech Bloody B140N

— Wired. Connection using a cable with one or another type of connector — most often USB, less often PS/2 or a proprietary plug (see "Connection interface"). Wired keyboards are notable for their low cost and overall convenience — in the sense that they do not require batteries and the operating time is unlimited. However the wire limits mobility; however, given that most often the keyboard is used in close proximity to the computer, this shortcoming cannot be called critical.

— Radio. Wireless connection over the air, usually through a wireless adapter connected to a computer via a USB port. The main advantage of this option can be called the actual absence of a wire; while the communication range is usually several metres, which gives freedom of movement and even allows you to use the keyboard as a "computer remote control". On the other hand, wireless models are much more expensive than wired ones, and their operation requires separate power supply from batteries or a rechargeable battery, the charge of which is limited — accordingly, the continuous operation time is limited. Separately, we note that this option is designed mainly for stationary PCs; if a wireless keyboard is needed for a laptop, it is better to pay attention to Bluetooth models (see below).

— Bluetooth. Another way to wir...elessly connect keyboards. Technically, Bluetooth is based on radio waves, but this technology has its own characteristics, so it is listed separately from the "normal" radio connection (see above). The main one of these features is that many models of modern electronics (almost all laptops and tablets, some PCs, etc.) are equipped with built-in Bluetooth modules, which allows you to connect such keyboards without using additional adapters. In addition, the range of such a connection is officially at least 10 m (in fact, of course, it depends on obstacles, interference, etc.). It is this option that will be optimal if you need a wireless keyboard for a Bluetooth-enabled device.

— Bluetooth / radio. Wireless keyboards that can connect both via Bluetooth and radio. See above for more details on each of these options. Also note here that such a keyboard is usually connected directly to a Bluetooth device (for example, a laptop), and if the computer does not support Bluetooth, you can connect a USB adapter to it and use a radio connection. Thus, the keyboard is as versatile as possible in connection. However, such versatility significantly affects the cost, and is required not so often; so this option is not widely used.

— Bluetooth / radio / wired. Keyboards that support all three connection methods described above. This is the most versatile option, giving the user the freedom to choose for different situations. For example, while playing a game or watching a movie, you can sit in a comfortable chair away from the screen by connecting the device wirelessly, and when typing or surfing the Internet, you can move to the table and use the wire, saving battery power. At the same time, such versatility is not often required and is expensive, so models with this type of connection are not popular either.

A version of the "blue tooth" technology for connecting the wireless keyboard to other devices from the outside as a manipulator. The higher its serial number, the more stable and noise-proof connection is provided. At the moment, Bluetooth v 5 is the most advanced standard in keyboards.

The keyboard's ability to quickly switch between multiple devices. Multi-Device allows you to simultaneously work with a tablet, TV, and other devices with one keyboard.

The length of the cable that the keyboard is equipped with for wired connection (see "Connection type").

When choosing this parameter, you should first of all take into account the distance from the device to the connection port: a cable that is too short may simply not reach the connector, and a cable that is too long may get confused at hand and create inconvenience. As for specific values, the reference length is 1.8 m. However, there are cables both shorter and longer.

The range of the wireless connection provided by the keyboard (see "Connection Type").

Almost all modern wireless models work confidently at a distance of at least 2 - 3 meters. So you need to pay attention to this parameter mainly when the keyboard is planned to be used at a greater distance from the computer. At the same time, when evaluating the range, it should be borne in mind that it is indicated for ideal conditions: the absence of interference and obstacles in the signal path, the battery is fully charged, etc. In practice, the communication range may be somewhat less, so when choosing, it is worth taking a certain margin. Nevertheless, according to the declared range, it is quite possible to evaluate the practical capabilities of different models and compare them with each other.

— Game. Keyboards designed for use in computer games. Outwardly, they are distinguished by a characteristic design, often quite original and aggressive; some key keys, such as WASD, may be highlighted in colour. In addition, the design may provide various special equipment — additional programmable keys, headphone and microphone jacks, a screen with the ability to display in-game chat, etc. Some of these models are created for specific popular games. Keypads are a separate type of gaming keyboards (see "Format").

— Ergonomic. Ergonomic keyboards are distinguished by a specific layout aimed at making long-term work on them as comfortable as possible. The keys of such keyboards may not be located straight, but in an arc, have a rhombic shape, the alphabetic part of the keyboard itself can be divided into two parts located at an angle to each other, etc. Such design solutions provide a more natural position of the hands during work, which helps to reduce fatigue.

— For tablets. Keyboards specially designed for use with Tablet PCs. They can have special mounts and act as a docking station — with such a keyboard, the tablet practically turns into a netbook, up to the ability to fold the entire structure in the manner of a regular laptop (for ease of transportation and protection of the display from damage). Some models are ini...tially optimized for certain tablets. Because the size of modern tablets rarely exceeds 10", then the keyboards for them are made compact (see "Format").

— Keyboard case. Models that combine the functions of a protective case and a keyboard for entering texts or commands in one bottle. As a rule, keyboard cases are produced for certain tablet models, thereby expanding the functionality of tablet computers. When closed, such accessories tightly fit the tablet body and protect it from damage during transportation. According to the connection methods, keyboard cases can use a Bluetooth connection, proprietary connectors or USB.

— For TV. Keyboards designed for use with Smart TVs. These TVs can connect to the Internet and use various network services, and many of them allow you to install additional applications. Both may require a full keyboard — for example, with its help it is convenient to enter text in Skype, search for content by name, or play some games. Common features of "TV" keyboards are, firstly, a compact format (see below), secondly, wireless connection (in most cases; see "Type of connection"), thirdly, the presence of additional buttons and other controls to operate individual TV functions. When choosing such a model, it is worth clarifying its compatibility with a particular TV.

— Flexible. Keyboards made of elastic materials and having a flexible body — most often in the form of a rubber "mat" with protrusion keys. Such models are extremely easy to transport: a flexible design makes it easy to squeeze the keyboard between other things, bend it, or even roll it up. Another advantage is that the “board” can be easily made moisture resistant (although this is not necessary in this case). At the same time, in terms of the “response” of the keys, a flexible keyboard can differ markedly from more traditional ones, and it may take some getting used to working on it. And in terms of format (see below), such models are most often compact.

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 Num-block — an additional block with numeric keys and arithmetic signs. Compact models, respectively, do not have a num-block, 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, ther...e 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:

— Num-block. 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 Num-block separately from the keyboard is easier than finding a place for a full-sized "board". Another option for using the Num-block 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 distance that the key travels when pressed — from the initial position to touching the contacts and sending the "command". Indicated as high or low. Keyboards with low key travel(3 mm or less) are considered to be more comfortable for fast input (such as fast typing). However, the best option largely depends on the habits and preferences of a particular user.

— Classic type. Keyboard with keys of the usual square and rectangular shape, with a small distance between them. Such keys usually expand downwards so that the gaps between them are as small as possible.

— Island type. Also known as "soaring" or chiclet. This is a keyboard in which each key is installed in a separate hole at a small distance from the others. Island models are more convenient than classical ones in that they are less likely to accidentally press the adjacent key. On the other hand, they are more difficult to clean: debris that has clogged into the gap between the key and the “board” itself is quite difficult to clean out, while contamination can create problems in operation.

On the practical side, the choice of a particular type of keys depends primarily on the personal preferences of the user.