Over-the-Ear style headphones Foldable design Bluetooth wireless technology TF card slot Plays WMA/MP3 audio Built-in FM tuner Hands-free calling function when paired with smartphones Built-in rechargeable battery Charges via USB SD card option These Wireless Folding Stereo Headphones embody both comfort and clear precise sound into one attractive pair of headphones. Connect one of these three sleek colored headphones to your smartphone, tablet or media player and you're ready to go! When the headphones are not in use, they fold up conveniently for travel and storage. Over-the-Ear Foldable design headphones Bluetooth wireless technology TF card slot, Plays WMA/MP3 audio, Built-in FM tuner Hands-free calling function when paired with smartphones Built-in rechargeable battery, Charges via USB Brand No Brand SKU OT776EL0JI5USNAFAMZ-158058 Model 02