1、The case is made of metal, which makes it strong and durable, it can also shield from electromagnetic interference. 2、This product supports stereo and headphone dual channel output, makes your life more convenient. 3、It has a powerful compatibility, which makes it support web player, DVD, for PS3 and etc. 4、Your listening need to be cared, this product comes with the volume adjusting knob, making the operation more convenient. 5、One you plug in, you can use it, it also support headphone output, one click to switch mode, using a new generation chip to support higher sampling rate and high speed computing. 1 x Digital to Analog Audio Converter1 x Power Line1 x Manual Condition: 100% Brand NewItem Type: Digital to Analog Audio ConverterMaterial: Aluminum AlloyColor: As Picture ShownWeight: Approx. 216.0g/ 7.6ozInput Audio: Coaxial /Optical Digital AudioOutput Interface: L/R, Headphone, Coaxial, Optical FiberInput Audio Connector: Optical Fiber RCA(Coaxial)Analog Audio Output Connector: 2Pcs RCA（R/L）, 3.5mm/ 0.1in HeadphoneDigital Audio Output Connector: Optical Fiber RCA(Coaxial)Signal Sampling Rate: 32, 44.1, 48.96,192KhzResolution Rate: 16Q: 200mW                            300Q: 20mWDistortion: < 0.01%（10mW）Headphone Impedance: 16Q-300QFrequency Response: 10Hz-48KHz