Eclipse - Fujitsu Ten CD5444 - Manual (Page 37)

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ESN security operating procedure
[FUNC] button
Button [4]
How to read the Electronic Serial Number
Check that the Power is OFF. 1
Press and hold button [4], then the [FUNC] button, and
hold both for more than one second.
2
[ESN] appears on the display, followed by an eight-digit
number; this number is your electronic serial number (ESN).
You may use this number to identify your Eclipse CD5444 in
the event it recovered after being stolen.