Modem speed
The minimum speed for faxes is typically 9.6 Kbps. Often there are options - 14.4 Kbps and 33.6 Kbps. The higher the modem speed, the faster the fax message is received or transmitted. However, if you have a fast fax, but your recipient does not, the speed will still be low, it is determined by the capabilities of the `weakest` link of the chain.
Print speed
The maximum number of pages a fax can print per minute. Typically, the speed is somewhat lower than that of printers using the appropriate technology (laser, inkjet, etc.), however, the tasks facing the fax owner are somewhat different.
Sending faxes
This feature is useful for
sending faxes simultaneously(in one session) to two or more destinations. The maximum number depends on the specific model.
Received Fax Memory
The number of received/queued/sent pages that fit in the fax memory. Often used to send a delayed message, or to print out with a delay if the fax runs out of paper.
Phone features
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Caller ID. Automatic caller ID. Allows you to find out the number of the caller and/or sender of the message.
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Speakerphone. The ability to conduct a telephone conversation without using a handset, including — at a considerable distance from the fax.
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Answering machine. The ability to leave a voice message for a caller who wants to send you a fax, as well as the ability to leave a response voice message.
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Autodial. The ability to send a fax even in the absence of its operator — when the line is free or available.
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Notebook. Allows you to store several numbers of recipients in the fax memory, quickly organize the reception / sending of messages, and also make mailings to several recipients at the same time (during one session).
Auto feed tray capacity
The larger the capacity of the tray, the less often you have to worry about refilling paper in it.