Hifiman EF2C

Input Impedance : 47k Ohms
Output Impedance : 32 - 300 Ohms
Max. Power Output : 600mW@35 Ohms
Line-in Max. Output : 4.6V Distortion: 2%
USB DAC Max. Output : 3.2V Distortion: 0.46%
Frequency Response : 20Hz-20kHz
S/N : 90dB
Power Supply : 110v/220v
Dimensions : 5.7" (144mm) Wide x 4.3" (110mm) Deep x 3.1" (78mm) High
Weight : 3lbs (1.36kg)