Tunturi ALPHA 200 - Manual (Page 9)

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4. FUNCTIONS :: EXTRA
The Extra function helps you make adjustments to Alpha 200 properties.
You can also update Alpha 200 software in Extra.
1. Press function key Extra.
2. Press Settings key.
:: You can select the Alpha 200 language with the left/right setting
keys. The factory default setting is English. You can proceed to the
brightness setting with the up/down setting keys.
:: Use the left/right setting keys to make any adjustment. You can
adjust display brightness on a scale 0-7, where 0 is the darkest.
:: Press OK key to confirm your settings.
3. SW key is for software updates.
:: NOTE! Do not press the SW key unless you are updating your
Alpha 200 software.