Thank you for viewing. This is the Etymotic Research HF5 COBALT in-ear earphones. I purchased and stored these a long time ago, but since I have no plans to use them, I'm putting them up for sale. In my personal impression, the sound resolution is very high, and it's a good-sounding earphone that allows you to hear even the smallest sounds clearly and flatly. I confirmed that it works properly before listing it. Since it's used, I think there is some degree of wear and tear. Please check the photos for the condition. I will include the included pouch and a larger ear tip that I had on hand as a bonus (the ear tip was used with another old earphone, but it can be attached). Everything in the fourth photo is included. I plan to pack it neatly and send it via Yu-Packet Post Mini. Please purchase only if you understand that this is a used item. Thank you for viewing.