This site has inexpensive electro med devices and this link's product relates to the origin of Becks info on this Brain Frequency Tuner type technology. see: Scenar
and check the noticably less expensive ear clips: http://www.discountmedicalsupplies.com/ear-clips-one-unit.html?gclid=Cj0KEQjw...
Many electro med devices can only be advertised as having certain minimal applications(pain reliever, ect) because of FDA restrictions, so we may have to read between the lines to understand a products deeper therapy implications and applications.
Cyma Sound tracks also have easy and inexpensive applicability (download, edit ect)