Features‎:‎● Multi‎-function‎:‎ 2 in 1‎,‎ can be used as USB DAC or headphone amplifier● 24bit / 96KHz USB connection for highest quality sound● Support RCA‎,‎ BNC‎,‎ USB‎,‎ optical fiber interface‎,‎ wide use range● Support optical signal‎:‎ 16bit ‎- 24bit‎,‎ 32KHz ‎- 192KHz● Full metal shell‎,‎ nice touch feelings‎,‎ cool decoration● Free changer‎,‎ 6.35mm audio port to 3.5mm audio port‎,‎ available for both ports● Metal RAC input / output interface‎,‎ abrasion resistant● Beautiful appearance‎,‎ perfect giftSpecifications‎:‎● Headphone amplifier‎:‎Impedance‎:‎ 16 ‎- 600ohmsOutput power voltage swing‎:‎ 19.2V‎,‎ can use 600ohms headphoneFrequency response‎:‎ 4 ‎- 32KHzDigital noise floor‎:‎ Less than 0.01mVSignal to noise ratio‎:‎ 110dB● Decoder‎:‎Sampling frequency‎:‎ 96KHzDigital noise floor‎:‎ Less than 0.005mVSignal to noise ratio‎:‎ 114dBMaximum USB sampling frequency‎:‎ 96KHzMaximum optical fiber sampling frequency‎:‎ 192KHz Package weight‎:‎ 0.945 kg Product Size‎(‎L x W x H‎)‎‎:‎ 19.50 x 11.50 x 5.00 cm / 7.68 x 4.53 x 1.97 inches Package Size‎(‎L x W x H‎)‎‎:‎ 28.00 x 20.00 x 8.00 cm / 11.02 x 7.87 x 3.15 inches Package Contents‎:‎ 1 x Headphone Amplifier‎,‎ 1 x Audio Adapter‎,‎ 1 x USB Cable‎,‎ 1 x Power Adapter‎,‎ 1 x English User Manual