Attachments for a high frequency machine, as used in some beauty therapy treatments.

Rather them than me. Whilst I repaired the machine, I wouldn't willingly test it on myself. Too many of their gadgets seem to give you shocks - something this electronic engineer strives to avoid... normally. At safety test time, "Maybe just a teeny touch." ZZZTT! "Aargh ya b******!"

Turn it to the minimum setting next time. And try on someone else.