User manual

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Power Usage
Go to "Settings" > "Battery" > "Power Usage".
You can view power usage of today, yesterday and 2 days ago. You can
also view apps' foreground and background activity time, and their
power consumption.
Power Saver Options
Go to "Settings" > "Battery" > "Power Saver Options" > "Sleeping Mode".
This feature can sense when you might be sleeping, and then switch to
Low Power Mode to make your phone more power-efficient.
High Performance Mode
Go to "Settings" > "Battery" > "High Performance Mode".
The system will operate in high performance mode, but it will increase
extra power consumption.