I purchased the 7. For someone else who has a different gait these would be great, however I could tell over time I would get a sore so unfortunately I had to return these. I enjoyed the premise of the book very much and the story flowed nicely. Comes with AA battery in package. and could maybe use an extra one on the higher tension end). The template a hole in a middle for attaching the adapter. Me encantaron porque investigué mucho sobre audífonos y fueron la mejor opción en todos aspectos The earbuds are great. lightbulb moment. Not gonna pretend these are actually COMFY.