Sony PCG-R505ECP - Manual (Page 49)

Connecting the Docking Station
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4 Remove the computer from the docking station, while moving the computer
slightly back to disengage it from the two front latches of the docking
station.
Disconnecting the docking station when the computer is on
You can use the Start menu in the Windows® taskbar or the UNDOCK switch on
the docking station to disconnect your computer from the docking station while
the computer is on.
Releasing the Computer from the Docking Station
Removing the Computer from the Docking Station
Pull release levers on either side of
rear corners of docking station