Thank you for asking; OBST is absolutely, completely safe.  In fact, it is as safe as listening to your favourite radio station.

OBIL has developed a proprietary methodology to carry a modulating range of ultra low frequencies in the alpha-theta-gamma-delta range simultaneously with specific audible sound clips.

All of the equipment utilized in the OBST system is commercially available from established Corporations such as Apple for the Tablet, and JLabs for the Earbuds.  All of which have rigorously tested and approved for consumer use.