A liquid composition applied transdermally for relief of pain comprising alcohol in an amount by weight of about 57 to about 91 percent; glycerin in an amount by weight of about 1 to about 12 percent; an analgesic agent in an amount by weight of about 2 to about 28 percent, the analgesic agent comprising a derivative of salicylic acid; methylsulfonylmethane in an amount by weight of about 0. Sun of first set is connected to eighth shaft connected to sun of second set and is connectable, via third clutch, to drive shaft. The pole pieces cooperate with the magnets to generate a magnetic field that is substantially symmetrical relative to the axis and which has a magnetic flux density that linearly varies along the axis. Otherwise, the controlling transmits a second control message to the mobile terminal, specifying a positioning method.