The Sys*Stim 228 intramuscular simulator has four discrete waveforms: Interferential, Premodulated, Medium Frequency (Russian) and Biphasic waveforms. In addition the clinician can set on/off times, pulse width and frequency along with frequency modulation for some of the waveforms. An optional carrying bag » made especially for the Sys*Stim 228 and its accessories is available as well as a treatment cart that also will hold the Sonicator 740.