Ultrasound emits sound waves from a hand-held wand which can penetrate 1 and 2 inches deep into the soft tissues of the body. These sound waves increase heat, improve circulation in the area, while also relaxing muscles, and healing tissue damage. Electrotherapy works by applying two pads on the area of discomfort or injury. The unit then emits an electric signal which then activates the natural opioid pain-relieving system in the body.

Combination units can be powerful additions to most treatment regimens because of their ability to decrease pain, swelling, and relax tense or spasming muscles.