contraption
Definitions
A machine or device that appears strange, unnecessarily complex, or improvised.
A gadget or piece of equipment, often one whose function is not immediately obvious.
Examples
The inventor spent years tinkering with his strange mechanical contraption in the garage.
I have no idea how to operate this complicated contraption, so I think I will just stick to the manual version.
Synonyms
gadget device mechanism appliance machine contrivance apparatus