If you google cold laser therapy, and scroll there is a review of devices, including the strength of the laser per unit. Rehabmart. I would research the strength of the laser, and if it has a timer, to protect your skin. Also, note how it is used clinically aka read the directions. I would buy it from a medical device sales company. I have done CLT and the treatment worked wonders over 4 weeks 2x per week. So, know that to use this device too often and too long could backfire, figuratively and literally.