I have a replacement fiio dac which does me fine, so selling this - it was a bit of an overkill.in excellent working condition AUDIO-GD NFB-15 .32 with power supply, usb cable to connec to computer and coaxial cable.this device can also be connected via optical which is greati had these set up with my yamaha hs7 summary website: http://www.audio-gd.com/Pro/Headphoneamp/NFB1532/NFB15.32EN.htmSummarize Fully discrete analog stages without any OPA and couple caps in the signal channels. Non- feedback ACSS analog output stage . Total of 6 groups dedicated power circuits are used to purify the power supply. Applies a custom order ALPS 27 volume pot for reducing channel imbalance and improving on sound quality. 3 channels digital input : coaxial / Optical / USB DAC output : RCA (User can setting with either variable level as DAC with preamp combo or fixed output level as dedicated DAC ) Headphone output : 6.3MM SE Supports 2X , 4X and 8X oversampling customers setting High-End grade parts built in , ALPS 27 volume pot , Toshiba optical receiver and transistors , gold plate pure copper RCA sockets ect.