This is an add-on service to go along with the bioresonance frequency package. Each package comes with atleast one custom playlist, where the package of 10 comes with two.
 
I recommend purchasing only when you know you will be needing this extra add-on service, which is usually identified as we work together.
 
*NOTE this is not a physical product, it is a virtual product that is utilized in the bioresonance frequency packages.