I have checked with Massdrop on the warranty for the Klipsch X11i sold. It come with 2 years international warranty.
Below is the response.
Nate S. (Massdrop Community Support)
Aug 13, 2:36 PM PDT
This is Nate with Massdrop Community Support, following up with you in regards to your question on the Klipsch X11i In-Ear Headphones warranty. I would be glad to assist you.
I can confirm that this item comes with a Klipsch 2 Year Warranty, and that this warranty covers international use. Please feel free to reach out to us if you experience any issues with the headphones and we can look into what options we have.
Let me know if I can answer any other questions you may have as well, I am happy to help.