Fully charge the earbuds along with the charging case before the first use. The charging case is for charging the earbuds only. LED behaviors: 1 LED- 25% 2 LED-25%-50% 3 LED-50%-75% 4 LED-75%-99% NO LED-100% Fully Charged You can keep the earbuds in standby mode for up to 3 hours without having to return them to the case. beyond this point the earbuds must be returned to the case for charging. You should receive up to 4 hours of playback with additional 24 hours of backup power from the charging case.