These Grundig headphones 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 you can recharge using a USB-C cable. Overall, the earbuds take about 1.5 hours in the case to fully charge. Once fully charged, you can use them for up to 2 hours continuously to listen to music or make calls. Perfect, for example, for a train ride home. Thanks to the in-ear design, these earbuds fit directly into the ear canal. This provides better insulation against ambient noise, keeps them securely in place, and offers greater comfort. In addition to listening to your favorite music, you can also use the earbuds for wireless phone calls.