An answer to your deepest question: how does the electrical pain change versus frequency. You don't need to look further. You can read my articles here: http://www.electroboom.com/?p=688 Follow me on Facebook: http://www.facebook.com/ElectroBOOM Support ElectroBOOM at Patreon: http://patreon.com/electroboom Follow me on Twitter: https://twitter.com/ElectroBOOMGuy By: Mehdi Sadaghdar