Comparison Logitech G915 X Lightspeed Tactile Switch vs Logitech G915 Lightspeed Wireless Tactile Switch

Keys made of polybutylene terephthalate (PBT), one of the most durable and long-lasting plastics for keyboards. Unlike ABS keycaps, they are more wear-resistant, do not become glossy over time, and are resistant to mechanical abrasion. The latter is also facilitated by high-quality application of symbols, for example, by double casting (Double Shot) or laser engraving. PBT keycaps have a rough texture that is pleasant to the touch and provide a clearer and tactile response when typing.

The number of programmable keys provided in the design of the keyboard. Like the additional ones described above, such keys are located outside the standard layout. At the same time, they do not have a rigidly defined purpose — each individual function can be set by the user himself, hence the name. Some manufacturers, however, can initially programme these keys, but this programme can still be changed if desired.

The advantage of such equipment is obvious: additional features of the keyboard can be easily customized. Gamers especially appreciate this feature, so programmable keys are often found in gaming models. On the other hand, the keys themselves usually have neutral markings (for example, P1, P2 ...), and the user has to remember which function is “linked” to where; this can cause confusion.

The presence on the keyboard of the Fn key(short for function). It belongs to modifiers, similar to Shift or Ctrl: by itself it does not perform any action, but when pressed simultaneously with another key, it changes its original purpose. Fn is often found in compact keyboards (see "Format"), but can also be set in full-sized ones. The features it provides include quickly changing the screen brightness or sound volume directly from the keyboard, using the centre keys as a Numpad, launching individual applications, and so on. Specific features of using the Fn key depend on the keyboard model.

Operating time of the keyboard on battery power (see "Power") on a single battery charge.

The operating time in this case is rather approximate: it is specified for an average mode of use, and the actual autonomy may be either less or more than stated, depending on the specifics of use. Nevertheless, it is a fairly reliable indicator that can be used to assess different battery models and compare them with each other: the difference in the stated operating time usually quite corresponds to the difference in actual autonomy.

— microUSB. One of the miniature versions of the USB connector, still popular in gadgets, despite the emergence of the more advanced USB C. It has relatively modest capabilities (in particular, it is inferior to USB C in terms of the maximum possible charging power), but this point is rarely critical. At the same time, there are a great many cables and chargers for microUSB.

— USB C. The latest (as of late 2024) type of USB connector. It is symmetrical, which allows you to insert the cable in any direction, eliminating the possibility of incorrect connection. USB-C is more reliable, has an increased service life and supports higher data transfer and charging speeds. In addition, it is compatible with modern devices and is gradually becoming a universal standard, which makes keyboards with such a connector more convenient and relevant for users.