21according to preference.NOTE: The unit will automatically reduce back light level after remainingidle for 1 minute.2. VolumeThere are 10 volume levels to choose from. The unit comeswith a default setting of 70% and is adjustable according topreference.3. Auto Screen Shut-offThe unit will automatically reduce back light after remainingidle for 1 minute.4. Button SoundsThis function configures whether to provide an audible feed-back when a button is pressed.5. Time Zone Setting6. System Language7. Voice LanguageThe unit gives voice reminders under special circumstances.Available options are English and Chinese.8. Satellite Status

Garmin gdr 45 Quick Start Manual