Lightweight and comfortable bone conduction headphones with excellent balance between sound quality and external sounds. - Brand: SHOKZ - Model Name: OpenRun Pro2 (Kipchoge Collaboration Model) - Accessories: Charging cable, instruction manual, case - Color: Gray/Orange - Type: Bone conduction headphones Thank you for viewing. I purchased these headphones this year, but I've been using BOSE headphones until now, and this was my first time trying these. However, the sound quality wasn't quite to my liking, as there were some songs where I felt the beat too strongly, so I'm considering selling them. I used them for running and marathons, and I washed them with water every time I used them. I also never dropped them, so I believe they are in good condition without any external damage. The sound quality and other functions of the headphones can be adjusted through the app. Personally, I feel the low-frequency beats are a bit too prominent, but this is just my personal opinion, so please evaluate them after listening. Please note that this is a used item that has been handled by another person, so please refrain from purchasing if you are concerned about this. We cannot accept any claims regarding the product after purchase. The headphones will be provided in the original white box (with the instruction manual, etc.). (Please note that there may be some minor stains on the outer box from storage.)