ZIIP comes with a standard micro USB charging cable. You can charge your ZIIP whenever it is most convenient for you. When used regularly, a full battery will last approximately 3 to 4 weeks. If during a treatment the orange light near the charging port softly flashes, finish that treatment and then fully charge your ZIIP. When your ZIIP is charging, the orange light near ZIIP's charging port will illuminate. When this light is off, your ZIIP is fully charged. When you unplug your ZIIP from the charging cable, you will need to press the power button once to turn your device off.