Storage capacity
The amount of the reader's own built-in memory, i.e. the memory used for persistent data storage. The more memory, the more content can be stored at a time in the e-book. At the same time, note that even the largest text (TXT, FB2, HTML) files, usually, rarely exceed 2 – 3 MB, so relatively little memory is needed for storage. Graphic and audio files, in turn, are more voluminous, but most of the space is needed for video files. Therefore, depending on the use of the gadget, you will need a different volume, whether it be
4 GB, 8 GB or more. Many readers support the ability to expand their own memory through removable cards (see
Memory card slot).
Card reader
Possibility of expansion of own built-in memory at the expense of replaceable memory cards. In addition to increasing the amount of memory, such a medium facilitates the exchange of information between an e-book and other devices: for example, you can download a book to a laptop equipped with a card reader, write it to a memory card and install the card in an e-book. Note that at the present time several types of memory cards are actively used, and not all of them are mutually compatible; therefore, when buying a book with a memory card slot, you need to pay special attention to the type of cards supported.
Data transfer
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3G module. Wireless communication module based on third generation mobile networks (3G). According to the standard procedure, to connect to the 3G network, you need to purchase a SIM card. However, some Amazon Kindle models provide users with free 3G Internet access right after the first turn on.
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Wi-Fi. A wireless communication module that allows you to connect the reader to wireless local (home or office) networks, as well as access the Internet through public access points (hot spots) installed in restaurants, hotels, railway stations, etc.
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Bluetooth. Direct wireless communication technology between various electronic devices. In e-readers, Bluetooth is primarily used for file transfer: with this function, you can connect the reader to another Bluetooth device, such as a laptop or tablet PC, and exchange files with it.
— microUSB. Connector for direct connection of the reader to the USB port of the computer using a special cable. In e-books, this connection is used primarily for file sharing. MicroUSB is a universal standard that allows you to connect various gadgets through it with one cable.
— miniUSB. Similar to the one described above, the connector, which differs only in the size and shape of the connector.
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USB-C. Symmetrical USB connector, which is gaining popularity and
...in the future is able to displace microUSB. At the same time, the connector has a high data transfer rate and is only a little larger in size.Dust-, waterproof
The level of protection of the device electronics. It is determined according to the IP standard and is marked with two numbers: the first indicates dust protection, the second — about water protection.
Dust protection values:
5 — dust resistance without complete closure (a certain amount of dust can get inside, but it is small and does not affect the operation of the device)
6 — full protection (dust is not able to penetrate inside the case).
Waterproof values:
6 — protection against sea waves and strong water jets (some of the water may get inside, but it does not impair performance);
7 — the possibility of short-term immersion under water to a depth of 1 m (protection against falling into puddles and other shallow water bodies);
8 — the possibility of long-term immersion to a depth of 1 m or more (the specific value may vary), as well as long-term work in a submerged position.
