Charging your ASUS Tablet on the ASUS mobile dock
To charge your ASUS Tablet on the ASUS mobile dock:
Connect the USB Dock cable to the power adapter.
Insert the 36-pin connector to the USB Dock port of your ASUS mobile dock.
Plug the power adapter into a grounded power outlet.
Charge your ASUS mobile dock for eight (8) hours before using it in
battery mode for the first time.
ASUS Tablet E-Manual