I did not even have to use tools. On battery life, I can again attest that its as good as the 16 hour advertised. I can’t say I noticed the difference in practice, but it’s satisfying to know there’s a better mechanical design under the hood. I am VERY impressed with the thumping bass quality of these buds. And I didn’t even know THEY LIGHT UP! Previously I had a case that lasted me 4 years so it’s not like I treat my cases bad it’s just that this case seems to not have a very long life. bass response is very good - not the best I have ever experienced but very respectable for at this price point. This is not a surprise as the sound resonator is your own head. But the muffs completely go over my ear. These are super chunky and make your feet look like boat feet.