Headphones type of fitting in ear transmission mode cordless bluetooth bluetooth version bluetooth 40 bluetooth profiles aac advanced audio coding aptx sbc subband coding sensitivity 105 dbmw impedance 25 ohm frequency response 20 20000 hz operating time 3 h battery charging time 1 h battery capacity 60 mah type of battery lithium ion weight 35 g included in delivery usb cable carry box with interated charging station