Water can kill. Aside from the obvious by drowning, you could drink too much too fast and die from a seemingly innocent activity that we partake in everyday.
Your body is exposed to frequencies all day long from multiple sources. If you have not yet experienced any major issues from this, I would suspect you have little to worry about using Spooky2.
The device does not generate very high frequencies (Gigahertz and above range) that is known to potentially cause damage.
The device does have a electrical contact mode that if used incorrectly can cause issues for those with electrical implants.
What I guess I'm trying to say is that it is safer than driving a car, but you still must be wise in how you use the device.
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