"It offers multiple hardware signal resolution options that are easily selectable via the recording software.
Depending on the recording needs, with just one “click” it is possible to switch from AC to DC mode acquisition as well as to extend the hardware bandwidth.
It's a shielded amplifier which can be taken directly inside the MRI chamber and placed in the bore right behind the subject’s head.
It can be used for simultaneous EEG/fMRI acquisitions as well as for EEG/TMS co-registrations, EEG/ERP studies and Brain Computer Interface applications.
The sturdy and compact amplifier is powered by the rechargeable PowerPack battery.
Multiple amplifiers can be combined and stacked on top of each other in order to increase the maximum number of available channels to 128 for recordings in the MRI environment and up to 256 channels for laboratory applications.
BrainAmp MR plus can be combined with the BrainAmp ExG MR to add the capability to record bipolar and peripheral signals (e.g. EOG, ECG, EMG, GSR - Galvanic Skin Response, etc.) in an extremely compact setup."

Manufacturer's description from brainproducts.com website.