Bluedio B Wireless and Bluetooth Stereo Headphones with FM Radio/SD Card slot (Black) Crystal andClearSoundQuality:2piecesof40mm150neodymiumdynamicdriversunit,providesyou clearbalancesoundquality of treble,midrangeandbass. Support FM broadcast / Micro SD card playback of MP3 audio formats *note: Micro SD card not provided Soft earcups/comfortable to wear: Its ear cups are padded with sufficient foam and covered with soft leather. With a stylish and popular design,it will make you famous and outstanding in the crowd. The Bluetooth perfectly works with your smartphone, tablet and laptop.