I have checked the audio on both sides and confirmed that there are no problems, although this is a casual inspection. This is a genuine product. I don't know the frequency of use as I obtained it used, but I think it's in good condition. Please note that it may take some time to respond or ship. If you are in a hurry, please refrain from purchasing. High-quality IE 300, comfortable fit, and comes with various ear tips. - Model Name: IE 300 - Accessories: Case, many ear tips - Color: Black - Design: Ergonomic shape Thank you for viewing.