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