Bluetooth headphones in ear headphones type of fitting in ear transmission mode cordless features in line control microphone function rechargeable music functions pause play call functions answer call end call sound mode stereo bluetooth bluetooth version bluetooth 41 button position on cable sensitivity 92 dbmw impedance 16 ohm frequency response 20 50000 hz max power handling 5 mw driver 86 mm operating time 5 h talk time 5 h batt