By themselves these earbuds have power for about 9 hours of music listening pleasure before needing a recharge. After I initiated the return then they contacted me. Provides what you need in a minimal space. I have been wearing these almost every day for about 3 weeks. I didnt want to go through the return process and order all over again. Most important, it protects the outside of the earpiece. Mounting hardware provided is less than perfect. I could probably make them work, but I am ordering the 10s to see. Most of that is probably because they were plastic or a hard-rubber. I purchased these EarSkinz covers after reading reviews on Amazon.