Expanding on the capabilities of standard-size mixers is where the MH400 works its , for instance when it is used as a sub-mixer. If you are running short on available channels on your 'big' mixer and need to add 3 more keyboards to your mix, just connect them to the MH400, dial-in the mix - and connect MH400's output to a single input on your main mixer. This is just one example of how the MH400 can add versatility to your current setup - just imagine the possibilities! Small and Superb: The MH400 is the Perfect solution for mixing multiple line-level signals on a budget. Sure, it's as cute as a button - but you'll want to own one because of what it brings to your performance. And the MH400 is so very affordable.For: audio amplification(eg, computers,musical instruments, etc..) Product structure: four-channel 6.35 four-channel independently adjust the volume;Four 6.35 input, one 6.35 output. Line input Type:6.3 mm Mono Interface impedance:Atleast 4.7 kQ Maximum input level:+16 dB Output Type:6.3 mm Mono Interface impedance:About80 Q Maximum Outputi Volume:+16 dBu Plug Type:EU Plug,it applies to Indonesia, Germany, France, , Italy and so on. size: 10.5 x 5.7 x 3.2cm Material:ABS colour:As shown Package Contents: 1 x Sound Mixer 1 Adapter 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.