I bought these as a replacement after losing one of my first headphones. Once you understand how charging works, it becomes clearer. When you connect the cable to the case, you charge the case. When you see 100 on the display, it's fully charged. The case is used to charge the headphones. You will notice that the numbers on the display will decrease as the headphones charge. The display in the case turns off when the headphones are charging. Otherwise, I love these headphones! The sound quality is excellent, especially when making calls. The advertised features they have are great and accurate! The best headphones I've bought so far and the only ones I've bought twice! The price is great too. My first pair + shipping cost me way more than Revain! An added bonus was that you didn't have to wait too long for them.
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