The battery case has 3 LED lights. The left and right light are green and pulse when the left and right earbuds are charging. The lights are solid when the earbuds are fully charged. In addition, the Jaybird app tells you the battery status of each earbud. The center LED light on the battery case also pulses when the case is charging and is solid when it is fully charged. The center LED light is red when the case's battery is low. You can charge the earbuds twice on a fully charged case. You can also keep the case plugged in when you are charging the earbuds. I just wrote a review that explains this more fully, so feel free to read it.