I purchased this through overseas mail order. It repeatedly restarted and was unusable in my car (2025 CIVIC RS). There was a post in the Amazon reviews stating that it was also unusable in the same model, so it seems that it doesn't work in my car. I am unable to confirm its operation in other car models, and I don't know if it's a initial defect, so I am selling it as a junk item because I cannot offer a warranty even if it is defective. Please purchase only if you understand that this is a junk item. There is no operational guarantee or support whatsoever. Thank you.