HTC Multifunction ALL-IN-ONE Audio Adapter

[IzelTokatl]

Has anyone tried this on their Eris? Thought it would be good for my car and at the price you can't beat it. Per comments on amazon at least one Sprint Hero user said it worked fine.

Amazon.com: HTC Multifunction ALL-IN-ONE Audio Adapter for HTC Touch T-mobile G1 Shadow II Wing Sprint Mogul At&t Tilt: Cell Phones & Service