Asus MeMO Pad E-Manual page 13

Micro USB 2.0 port
Use the micro USB (Universal Serial Bus) 2.0 to charge the battery pack or
supply power to your MeMO Pad. This port also allows you to transfer data
from your computer to your MeMO Pad and vice versa.
NOTE: When you connect your MeMO Pad to the USB port on your
computer, your MeMO Pad will be charged only when it is in sleep mode
(screen off) or powered off.
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