The FLIP 3 has 5 LED "dots" that indicate battery level. If the unit is charging, one of those "dots" would blink showing battery level and charging status. If the speaker is fully charged, all the LED "dots" would stay constantly lit and no other "dots" would be blinking. If the unit is switched OFF the LED dots will go out completely once fully charged. The FLIP 3 will show a blinking red light on the first LED "dot", letting you know that it already needs a charge.