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Sleep mode is the power-saving mode of operation. The
device actually switches off during user idle time to save
battery charge. No power is required for E-Ink screen to
maintain a displayed image.
By functionality mode:
Key locking – Key locking mode (by default
locking/unlocking is assigned through a short pressing of the
On/Off key).
Safe mode – service mode for device loading with
manufacturer’s settings. To load the device in this mode, hold
the Home button while turning it on.
Note: some functions become unavailable while a book is in
the process of opening. This is due to the calculation of the
number of pages.