Connection
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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.
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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).
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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.Multi-Device
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.
CMD / OPT keys
The CMD (command) key is an integral attribute of keyboards that are primarily designed to work with Mac OS computer systems. Plays an important role in the quick access service. So, in combination with other buttons, it allows you to open the command line and perform many other actions that are important for a computer system administrator. If we compare keyboards for Mac OS and Windows, then the “CMD” key is an analogue of the system “WIN” button (with the Windows logo), which opens the Start menu.
Similar tasks are assigned to the OPT (option) key. It is intended to be used in conjunction with other buttons to create keyboard shortcuts that enable a variety of additional functions in Mac OS operating systems. Drawing parallels with Windows keyboards, the OPT key is analogous to the Alt button. Typically, this key has the additional designation “⌥”.
Lighting
The colour of the backlight provided in the design of the keyboard.
In general, the
backlight performs two functions: practical (makes the keys more visible in low light) and aesthetic (gives the keyboard a beautiful appearance). However, it cannot be said that
non-backlit keyboards will be unusable in the dark, the light from the monitor will still illuminate the buttons. The simplest version of the backlight is one-colour. In this case, specific colours can be different: for example,
white is well suited for general-purpose keyboards (work or home), but other shades can be found in gaming or design models, for example,
red,
green,
blue,
purple or
orange. If two or three colours are indicated for the keyboard, this may mean either the ability to switch between these colours, or that this model comes in several versions that differ in the shade of the backlight; these nuances should be clarified separately.
The most advanced options are
multi-colour and
RGB backlighting. Multi-colour systems are called systems in which more than three colour options are provided, sometimes with intermediate shades. And RGB-backlight all
...ows you to choose almost any shade at the request of the user; in addition, the possibility of synchronization (see "Illumination with effects") is found mainly in such systems, although single-colour keyboards can also be equipped with other effects.
