Headband headphones bluetooth headphones series marshall major type of fitting on ear transmission modes cordless wired and wireless features gold plated jacks function rechargeable sound function in line volume control bluetooth bluetooth profile aptx button position on headphones sensitivity 91 dbmw impedance 64 ohm frequency response 10 20000 hz driver 40 mm number of drivers 1 operating time 30 h battery capacity 680 mah type of battery