Memory foam and leather headband for a touch of luxury, the he r9's steel headband is coated in high end memory foam and supple leather. The memory foam provides a comfortable fit, while the leather is breathable and hard wearing. The headphones are strong and lightweight, with a great musicality that is uncommon at this price. Finally, the striking crimson earcups are large enough to give the unique drivers enough volume to produce that stunning bass. Cable connection ndash dual compatibility mode the socket can accommodate both dual sided unbalanced 3.5mm cable and single sided 3.5mm balanced cable left socket. The he r9 comes with a dual 3.5mm trs cable included only. Hi res bluetooth bluemini add on you can convert the he r9 headphones to wireless operation with the provided r2r. This unit just plugs in unobtrusively to one of the input sockets. This quality unit is also made by hifi man and uses the proprietary himalaya dac. Most modern streaming codecs are built in, such as ldac, aptx hd as well as aac and sbc. One of the best chipsets is used with the qualcomm qcc5124. This has a frequency response of 20 hz ndash 20khz. Battery life is 6 7 hours.