Maxon 9-Series Overdrive Soft Distortion<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Input Impedance: 500k ohms (Output Impedance: 10k ohms or less) </span></li><li><span class="a-list-item"> Maximum Gain: 41.5dB(700Hz) </span></li><li><span class="a-list-item"> Equivalent Input Noise: -107dB or less (IHF-A) </span></li><li><span class="a-list-item"> Operating Voltage: 9V </span></li><li><span class="a-list-item"> Battery: 9V battery (6LR61 or 6F22) x 1 or Maxon AC adaptor </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41o3HVqySVL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/310OwY6hofL.jpg" noproxy>