Aries S is the basic unit for electrotherapy. The unit generates all commonly used currents: unidirectional (unipolar) and bidirectional (bipolar). The unit has the possibility of performing the electro-diagnostics of the nervous-muscle system, in auto mode it calculates rheobase, chronaxie, as well as threshold, coefficient and quotient of accommodation. It works perfectly as a current generator used together with ultrasounds in combination therapy. The possibility of setting constant voltage mode (CV), makes the operation with the ultrasound head as an active electrode, more comfortable for the patient. Small dimensions of the unit and its light weight makes it easy to transport and use beyond its dedicated place of operation (e.g. in the home healthcare environment).