Vbeam Perfecta uses a 595 nm wavelength that is well absorbed by oxyhemoglobin in blood vessels. When this light reaches dilated blood vessels, the absorbed energy is converted to heat, coagulating the vessel wall. Over time, the coagulated vessel is absorbed by the body. Because the target is blood rather than melanin, there is little effect on surrounding skin. The pulse width can be adjusted from 0.45 ms to 40 ms to match vessels of different diameters. The Dynamic Cooling Device™ (DCD™) sprays cryogen just before each pulse to protect the epidermis.