No more hassle of trying to get the earbuds synchronized to each other. The charging case also doubles as a powerbank for your earbuds and can be charged with the included Micro USB Cable. Once the battery of the case is charged, it will charge the earbuds 4x from 0-100%. With over 4hrs of playback time at max volume on a single charge these earbuds are a must for any traveller. The ergonomic design of the earbuds keep them in place on the go. The earbuds have built in “touch” music controls and dual microphones for hands free operation. It takes 1.5hrs to charge the earbuds from 0-100%. The case can be charged in 1.5hrs.