The M100 comes with a USB-C cable included, however any good quality USB-C cable will charge the M100 case effectively. If you would like to purchase another charging cable for your M100, you can do so directly from our website here.
You will need to ensure the cable is fully connected by pushing until there is a mechanical click sound and the battery indicator on the front of the case lights up.
To charge the earbuds, simply put them back into the charging case and charging will begin automatically.