The earbuds feature Bluetooth 5.0, Auto-Pairing, and Auto Power-On. Once the earbuds are removed from the case, they will power on and automatically sync to each other! No more hassle of trying to get the earbuds synchronized to each other. The case also doubles as a powerbank for your earbuds and can be charged with the included Micro USB Cable. Once the 400mAh battery of the case is charged, it will charge the earbuds 4x from 0-100%. With over 2hrs of playback time at max volume on a single charge these earbuds are a must for any traveler. The ergonomic design of the earbuds keep them in place on the go.