Bottom Side - Asus T100TAL E-Manual

Bottom side

Dock port
Connect the ASUS Mobile Dock to this port to support keyboard,
touchpad, and USB 3.0 port* functions.
Hinge holes
Align and insert the latch hooks into these holes to securely
attach the tablet to the ASUS Mobile Dock.
* on selected models only
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ASUS Tablet and ASUS Mobile Dock E-Manual