What people usually perceive is a tingling in their hands. Slight tingling, especially at the very start (which disappears quickly), or a short "shock" felt in the hands when you've just made a contact, would be OK (not dangerous). If they are using Spooky boost v2.0 and use the colloidal silver port, they will not feel it since there is a 10k resistor in the circuit to keep the current down. It will lower the power, but effectiveness does not require current higher than 0.5ma. Any current higher than that would only result in unpleasant sensations rather than better performance.
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