Dimensions (WxHxD):100*55*40mmBody Material:plastic WIFI:No Bluetooth:No PCM:No DSD (Direct Stream Digital):No DAC Model:JRC4560 Channels:4 Model Number:HA400 Stereo Audio Amplifier Type:Mini Amplifier Recommended Headphone Maximum Impedance:65-80 Ohm Built-in Battery:No Output Type:LINE OUT (AUDIO OUT) Input Type:LINE IN (AUDIO IN) Origin:Mainland China Feature 1:Ultra-compact stereo headphone amplifier Feature 2:With 4 headphone output channels and 1 input channel Feature 3:Home Amplifier Feature 4:for studio and stage application. Feature 5:Volume of each output channel can be controlled independently Feature 6:amplificador de auriculares Feature 7:Headphone Amplifier Feature 8:10MHz Earphone Amp for Music Mini Stereo Headphone Amplifier 4 Channels HA400 Ultra-Compact Audio Amplifier Power Adapter EU Plug 6.5MM to 3.5MM Converter Specification: 1.Ultra-compact stereo headphone amplifier for studio and stage application. 2.With 4 headphone output channels and 1 input channel. 3.Volume of each output channel can be controlled independently. 4.Provides highest audio quality for each headphone even at maximum volume. 5.Ultra low noise 4560 operational amplifier for outstanding audio performance. 6.Comes with a DC 12V power adapter. Product parameter: Operating Voltage: 4V~18V Wide gain bandwidth product:10MHz Rated power: 50W Slew rate:4V Chip type:RJC4560 Package List: 1 * Headphone Amplifier 1 * Power Adapter 1 * User Manual