Profoto A2 Monolight - Manual (Page 26)

A2
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Care instructions
To clean the A2, wipe with a soft cloth moistened with a little mild
detergent. Use another soft dry cloth to wipe dry.
Serial number and firmware version
The serial number is printed on the A2 underneath the battery.
You can also find the serial number on the display [5] under
SETTINGS>ADVANCED>ABOUT.