Nady MM-141 4-Channel Audio Mini Mixer:
The affordable MM-141 features 4 unbalanced line level mono 1/4" inputs with individual volume controls mixed to one 1/4" unbalanced output with a master volume control. Up to 20dB of output gain, a signal-to-noise ratio of 87dB combined with a frequency response of 10Hz to 100kHz make this mixer studio friendly, yet it is totally portable with 9V battery operation so DJ's and live sound engineers can take it on the road. The MM-141 can also be powered with the optional PAD-1 9V external power supply.
Battery Powered. Power supply Not Included, but can be purchased seperately.