remember what you are getting here , a chance to buy the only FDA approved portable medical class 3b lasers before they hit the market. Laser Classes: Class 1 lasers: example: laser printers. Class 2 lasers Example: barcode scanner/laser pointers. Class 3a not exceeding 5 milliwatts radiant power. ex: laser pointer Class 3b not exceeding 500 milliwatts radiant power. <---- THIS IS US Class 4 lasers - excedes 500 milliwatts : traditional large medical lasers https://web.stanford.edu/dept/EHS/prod/researchlab/radlaser/laser/procedures/classes.html