Expanding on the capabilities of standard-size mixers is where the MH400 works its magic, 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 very affordable. For audio amplification (e.g., computers, musical instruments, etc.) Product structure: Four-channel 6.35 mm; four channels with independent volume control; four 6.35 mm inputs, one 6.35 mm output. Line input Type: 6.3 mm Mono Interface Impedance: At least 4.7 kΩ Maximum input level: +16 dB Output Type: 6.3 mm Mono Interface Impedance: Approximately 80 Ω Maximum Output Volume: +16 dBu Plug Type: EU Plug, applicable to Indonesia, Germany, France, Italy, and others. Size: 10.5 x 5.7 x 3.2 cm Material: ABS Color: As shown Package Contents: 1 x Sound Mixer 1 x Adapter Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the real thing. Measurement allows an error of +/- 1-3 cm.