Opticon H21 - Manual (Page 35)

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2.5. Programming Buttons
To assign a function to the F1, F2, F3* and F4* buttons:
NOTE: F3 and F4 are only available on the Numeric version
1. Tap > Settings > Personal > Buttons > Program Buttons.
2. Select a button (F1, F2, F3*, or F4*) and assign a program from the drop down menu.
3. Tap OK to save and exit.