Справочник Пользователя для Samsung Galaxy Mega 2

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Basics
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Power saving feature
Power saving mode
Save the battery power by limiting the device’s functions.
On the Apps screen, tap 
Settings 
→ Power saving → Power saving mode, and then tap the 
Power saving mode switch to activate it. Alternatively, open the quick setting panel and tap 
Power saving to activate it.
Select from the following options:
•  Restrict background data: Prevent apps that are running in the background from using a 
mobile data connection.
•  Restrict performance: Limit various options, such as turning off the backlight for the 
Recent apps button and the Back button.
Ultra power saving mode
Use this mode to extend the device’s battery power. In ultra power saving mode, the device 
performs the following:
•  Restricts the available apps to essential and selected apps only.
•  Deactivates the mobile data connection when the screen turns off.
•  Deactivates the Wi-Fi and Bluetooth features.