First of all, these earbuds arrived at 100% charge, and well packaged. They connected quickly and without any issues to my Android smartphone. The sound is good, and they fit like any other non-adjustable earbud (they fit in my ears fine and haven't fallen out, but there is no adjusting for the size of one's ears). Haven't had any issues with the buttons on the earbuds, both work, i.e., sound up/down, music stop/start, all seem to work fine.
Glad I went with these earbuds after a bad experience with a different brand/model off of Amazon.