SUUNTO MOSQUITO - Manual (Page 72)

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3. Press S to change the selection in the following
sequence:
->On/OFF status -> AIR/EAN/FREE mode
When the AIR/EAN/FREE dive mode is selected
(blinking) press + or - to change the mode to AIR.
4. After you have set the AIR mode, press the M
button to save the settings and to return to the Setting
Mode [SET].
Fig. 4.9. Setting Oxygen
Percentage and Partial Pressure
(EAN mode only).