This is a SENNHEISER IE600. I'm selling it to help cover the cost of repairing another pair of earphones, as the repair estimate was higher than expected. Left and right channel balance is good. Both included 3.5mm and 4.5mm cables have no audio dropouts. I've only used these at home with my desktop, so the condition is reasonably good. I mostly used third-party ear tips, and only used the original M size ones at the beginning. The included items are only what's shown in the photos. If you need additional photos, please comment and I will add them. This is a used item, so please understand that it is generally non-refundable and non-returnable. Thank you for your consideration.