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. Comes with a DC 12V power adapter. Operating Voltage: 4V-18V Wide gain bandwidth product:10MHz Rated power: 50W Slew Rate:4V Chip type:RJC4560 Ultra-low audio performance,providing excellent sound quality Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage:AC220V Color:Black Material:ABS Package Contents: 1 * mini headphone amplifier Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.