Clinical Electrotherapy - Amrex Stim Unit - Spectrum MC-1 : Single channel MC1 micro-current stimulator provides easy to use treatment protocol. Spectrum MC1 micro-current stimulator provides easy to use treatment protocol. Intensity (20-1000 mA), frequency (0.5 - 620 MHz) and polarity are variable. Used with pads or probe (both included). Use AC power or battery pack.