Question about LaCie Mobile Drive - Space Grey

Hello
The hard drive has a USB-C (form) connector and USB 3.0 (USB technology).
Your Mac Book Pro 15" late 11 has USB-A (2 pieces, I think on the left side) with USB 2.0.
With the appropriate USB-A to USB-C cable, this should work.
https://www.digitec.ch/search
Hope that helps
LG