Headband headphones bluetooth headphones wireless headphones battery life 8 10hrs charging time 3 4hrs bluetooth frequency 2402 2480ghz bluetooth version v21 edr supported bluetooth profiles a2dp acrcp hsp hfp type of fitting on ear transmission mode cordless features microphone adjustable headband headset compatible with ios sound function in line volume control bluetooth sensitivity 114 dbmw impedance 32 ohm frequency response 20 20000