This Leem 4-channel micro stereo mixer is pocket sized and easy to use. Each of the four channels has two inputs, with each having its own volume control, dual master volume controls adjust the final, mixed, stereo output. Designed  for low power consumption. 9V battery powered.

Specifications:

• Frequency Response: 20Hz ~20 kHz
• Signal/Noise: 55dB
• Input Sensitivity: 1mV, Distortion 0.1% (T.H.D)
• Input Impedance: 600? unbalanced
• Output Impedance: 1.5K? unbalanced
• Clip LED: LED indication at onset of distortion
• Supply Voltage: 9V Battery (internal) or 9V DC adaptor (tip negative)
• Dimensions (W x H x D): 150 x 60 x 120 mm
• Weight: 320g