Asus TX201LA E-Manual page 18

Micro USB 2.0 port (for Android® only)
Connect the bundled micro USB to USB adapter into this micro
USB (Universal Serial Bus) .0 port to charge the battery or
supply power to your tablet. You can use this as a charging port
while using the tablet as a separate device.
When the tablet is used separately, you may also use this port
to facilitate data transfers from an external device.
MicroSD card slot
This built-in memory card reader slot supports microSD and
microSDHC card formats.
NOTE: When working on Windows® 8, you need to ensure that
the Android® system is also running.
18 ASUS Transformer Book Trio E-Manual