Laser therapy devices being used in the US today range in power output from 5 milliwatts to 12,000 milliwatts. Class 3a lasers are 5 milliwatts, Class 3b range from 5 to 500 milliwatts, and a Class 4 laser is any greater than 500 milliwatts (or half a Watt).

The K-Series Class 4 therapy laser has power adjustable from 0.1 to 8 Watts in the K-800 model, and 0.1 to 12 Watts in the K-1200. The adjustable power allows for a wide range of treatment protocols. Class 4 laser therapy delivers a therapeutic dosage to a large volume of tissue in a shorter period of time.