Mustek ScanExpress S40 Plus Manuel D'utilisation page 8

Installing Hardware
1. With the computer turned on, connect the two A-Type USB ends of
the USB cable to  USB ports of your computer and the other end to
the scanner.
. When the computer detects the new hardware being inserted, the
icon ( ) will appear under the Applications (MAC OS) or pop-up
message as below (PC OS).
Note: Follow on screen instructions to complete the hardware
installation as necessary.
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