SMSL audio silver VA2 headphone amplifier Specification: 20hz to 20khz bandwidth,600ohm load,un-weight Type THD+N: 122db Frequency Ripple:+/-0.1db max Crosstalk: 120mwat600ohm > 250mwat300ohm > 580mwat100ohm > 330mwat32ohm low-impedance power: > 120mwat100ohm > 75mwat32ohm color: black Machine Dimensions:1209522mm Gross Weight:0.7kg power:110v-240v