The instructions in English,
http://files.xiaomi-mi.com/files/power_bank_10000/powerbank10000-en.pdf
When charging devices blinking leds indicates percentage left in the powerbank.
0-25% 1, 25-50% 2, 50-75% 3 ,75-100% 4.
When charging the powerbank if all 4 leds binks there is a fault.
The button is to open and close the power in xiaomi devices , led light usb fan etc, or shows with the leds the percentage left.
For more details click the manual link above.
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Xiaomi 10000 mAh Power Bank |