The NYC CANS Wireless On-Ear HeadphonesfromElectro-Harmonixare engineered to give you three different options for audio entertainment. Use the built-in microSD slot and be free of both wires and mobile devices. Just load up a memory card (not included) with your favorite music, audiobooks, or other MP3 files, and play your audio right from the headphones. You can also stream your audio wirelessly over Bluetooth. Finally, if the batteries die or your device isnt wireless, you can still use your on-ear headphones with the included AUX cable.