These Grundig earbuds can be used completely wirelessly. You can easily connect them to your phone, laptop, or tablet via a Bluetooth connection (version 5.3) to enjoy your favorite music. The earbuds come with a charging case that can be charged with a USB-C cable. Overall, the earbuds in the case take about 1.5 hours to fully charge. Once fully charged, you can use them for up to 3 hours at a time to listen to music or make phone calls. Perfect, for example, for a round trip home by train. Thanks to the in-ear design, these earbuds fit directly into the ear canal. This provides better isolation from ambient noise, keeps them securely in place, and makes them more comfortable to wear. You can not only listen to your favorite music with the earbuds but also make phone calls wirelessly.