The Primo Combination 860 offers dual-frequency ultrasound (1MHz and 3MHz) and the complete range of neuromuscular stimulation outputs (NMES) that can be used individually or simultaneously in combination therapy. The Primo Combination 860 unit provides 4-pole and 2-pole interferential therapy as well as a wide range of other electrical stimulation waveforms. Therapeutic voltage and current waveforms may be applied to a wide range of conditions with successful outcomes. These include acute and subacute traumatic and inflammatory conditions, chronic rheumatoid and arthritic conditions, and pain relief.