The Flanger includes potentiometers for setting parameters Rate, Depth, Manual, Res and True Bypass in a solid polished stainless steel case.
The Rate knob lets you determine the speed of the oscillation. Depth allows you to set the depth of the effect. Manual and Res knobs work in conjunction to manage the delay and the intensity of the effect.
And use is a breeze, no need manual.
Indeed perfectly clear, no breath.
I use it with my strat Ibanez RG2550 and U.S., and reports are those expected of a flanger.
Brand unknown but has real qualities with very reasonable prices and well above that can make a Harley Benton or Behringer.