Bluetooth headphones wireless headphones in ear headphones series sony mdr as type of fitting in ear transmission mode cordless features microphone sweat proof splashproof waterproof functions auto pairing nfc music functions pause play volume sound mode stereo bluetooth bluetooth version bluetooth 20 button position on headphones frequency response 20 20000 hz driver 9 mm number of drivers 1 magnet type neodymium operating time 8 h talk