http://www.braintuner.com/Bob-Beck-Brain-Tuner/
BT-7 is an electronic instrument that produces over 500 harmonic frequencies to rapidly balance and restore the natural energies of your body and mind.  See an actual spectrum analysis of the BT-7 frequencies.  Research suggests that these subtle energies may be linked to improved memory, creativity, learning, and intelligence. Using BT-7 requires no special effort, training or discipline.  The BT-7 is preset to run for a 20 minute session and is applied with the use of earclip electrodes. 

Fantastisch! Wat natuurlijke energieën zouden kunnen zijn wordt aan de fantasie overgelaten.

Kennelijk voldoende goedgelovers om te blijven verhandelen: https://shop.zapper.nu/sota/bio-tuner.html

BIO-TUNER SOTA