The hifiman deva wired is an over ear open back planar headphone and offers a second to none ratio between price and performance. These headphones are technically the same as the hifiman deva. This wired version is not supplied with a bluetooth dongle and just comes with a headphone cable. However for this deva model hifiman applied its all new 80% thinner neo 'supernano' diaphragm nsd with a thickness between 1 and 2 microns so it delivers a stunning sound quality. The frequency response ranges from 20hz to 20khz which enables you to hear your music in its full glory down to the tiniest details. Despite the robust looking concept, the wearing comfort is high. The impedance is 18 ohms and the sensitivity is 93.5db. This means that you can effortlessly use this hifiman deva with your smartphone, hi fi amplifier or with a premium hi res music player for the best possible sound experience.