Used Canon double teleconverter. 45-day warranty.

Used Canon teleconverter, version II. The Canon 2x teleconverter doubles the focal length of Canon L-series telephoto and telephoto zoom lenses while reducing the lens's aperture by two stops.
Used condition: Very good condition teleconverter. All used equipment has been tested and checked.
Included: In addition to the telephoto extension, plugs on both ends.
Please note that the accessories included with used devices may vary and may not fully match the contents of the original packaging.
Warranty: 45 days.
VAT deductible: No.
What lenses does the teleconverter work with?
The teleconverter is compatible with certain fast telephoto lenses manufactured by Canon. You can find a compatibility list at the following link:
https://www.canon.fi/pro/infobank/lens-extenders/
Can I use the teleconverter with Sigma / Tamron lenses?
The teleconverter manufactured by Canon is not compatible with lenses manufactured by Sigma or Tamron.
Can a telephoto lens be attached to an EOS R series camera with an EOS R Mount adapter?
Yes, you can. Even then, check compatibility with your Canon EF lens.