The Denon AH-G20 headphones are made for traveling. Thanks to the active noise-canceling feature, distracting ambient noise is muffled. This means noisy airplane engines or talking people on the train won't bother you anymore. You can stream music from a smartphone or tablet using Bluetooth, so cables won't get in your way. Use the remote control on the ear cup to switch between songs and adjust the volume. Thanks to the built-in microphone, you can make hands-free calls. The battery lasts for up to 20 hours. Use the USB cable to charge it. No power source nearby? Connect the audio cable and carry on listening wired. An airplane adapter, hard case, and 6.3mm adapter are included with the travel headphones.