From MXR;

Based on the benchmark sounds of the MXR M117 Flanger, the MXR Micro Flanger features many of the same flanging effects of its big brother, but in a smaller and more convenient size. Originally released in the 80’s, this faithful recreation features the same two critical controlsa Speed knob to control the rate of cycling and a Regeneration knob to manage the overall intensityand stays true to its 100% analog bucket brigade technology for the ultimate in warm and organic tone. The Micro Flanger has been updated with a true bypass switch so you don’t lose any tone during bypass. Go from jet plane like sweeps to cool outer space type effects with the MXR Micro Flanger.