Zte F159 User Manual page 71

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Press OK Key to start timing.
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Press OK Key to stop timing. The screen will show the event time.
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Press OK Key to continue timing.
Press Right Select Key to reset.
Calculator
The phone provides a simple calculator accessible through the Extra menu.
• Press 0~9 key to enter numbers, Decimal to enter the decimal point.
• Press Up/Down/Left/Right key to choose +, –, ×, ÷.
• Press the Clear key to clear last digit and results.
• Press OK Key to Calculate. Press End key or Back to exit the calculator.
World Time
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