12. E18 indicator lights explained

A: 1. Status LED: red--powered on, no USB connection; pink--powered on with USB connection    2. Battery LEDs: 1 to 3 blue LEDs light in proportion to amount of battery power remaining.
    3. Charging: blue LED flashes, all three blue LEDs light constantly when fully charged.
    4. Low battery: 1 blue LED flashes when not charging