I just "upgraded" from my ancient ErosTek 312 to an ElectraStim Duo Flic. It's a great little device and super easy to use, but I regret not getting the higher-end model. (This will soon be corrected.) It has some nice settings, but I can't adjust the wavelength. Since everyone is different, it's helpful to find each person's balance of "tingly" and "stingy."
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I've broken all my toys. Would you like to be broken?