Yes, the ICON laser from Cynosure is a fractional laser system. Fractional lasers work by delivering precise microbeams of laser energy to the skin, creating tiny, controlled wounds known as microthermal zones. This process stimulates the skin's natural healing response, promoting collagen production and improving skin texture and appearance. Regarding the settings 1550 and 1540, they refer to different wavelengths used in fractional laser treatments: **1540 nm**: This wavelength is typically used for skin resurfacing and addressing issues such as fine lines, wrinkles, and scars. It penetrates the skin at a certain depth, stimulating collagen production and improving skin texture. **1550 nm**: This wavelength is often used for deeper skin rejuvenation, targeting concerns like deep wrinkles, acne scars, and other skin imperfections. It can penetrate the skin more deeply than 1540 nm, addressing issues in the middle dermal layer. The choice between these settings depends on the specific skin concerns being treated and the desired depth of treatment. Your dermatologist or licensed practitioner will determine the most appropriate wavelength and settings based on your individual needs and goals. Best of luck !