Dimensions (wxhxd):100*55*40mmBody Material:PlasticWifi:NoBluetooth:NoPcm:NoDsd (direct Stream Digital):NoDac Model:Jrc4560Channels:4Type:Mini AmplifierRecommended Headphone Maximum Impedance:65-80 OhmBuilt-in :NoOutput Type:Line Out (audio Out)Input Type:Line In (audio In)Origin:Mainland Feature 1:Ultra-compact Stereo Headphone AmplifierFeature 2:With 4 Headphone Output Channels And 1 Input ChannelFeature 3:Home AmplifierFeature 4:For Studio And Stage Application.Feature 5:Volume Of Each Output Channel Can Be Controlled IndependentlyFeature 6:Amplificador De AuricularesFeature 7:Headphone AmplifierFeature 8:10mhz Earphone Amp For Music