Speaking of batteries, I use lithium batteries in my headsets, and both seem to provide better battery life than you might think - at least 50 hours. Dieser Schuh ist sehr angenehm zu tragen nicht zuletzt auch durch die flexible Gummieinlage im vorderen Bereich. Great for my lad. It has a ugly boot up screen but besides that it automatically resumes from whatever song I left off. (I?m not going to yell at someone for wearing their shoes in my house. I tried to summarize my thoughts on whether it is worth it in the final paragraph. If you just push your key in, it will give you problems. this is a good buy***READ UPDATE IF YOUR SAMSUNG KEEPS DISCONNECTING THESE *****I noticed that my samsung s21 keeps disconnecting these after a bit of inactivity. Perhaps if I was knowledgeable in tuning an overclock manually, I could have better luck with the higher clock speeds these sticks are rated for. Maybe by another inch or so.