The FDA unloaded on Neurofield Inc. for misbranding of its products, which are only approved as class II biofeedback devices, as neurostimulation and electroencephalogram (EEG) signal processing devices. The warning letter called on “Neurofield to cease any activities that result in the adulteration or misbranding of the Neurofield X3000/X3000 Plus, Neurofield Q21, Neurofield64 and Neurofield EEG.”