... 1, speckle and spot removal 2, skin whiten 3, port design 4, 1 year warranty Main parts: Light ... water cooling system3.2 Assistant wind cooling 3.3 Semi-conductor cooling on the treatment head ... energy 2.Whiter skin, shorter delay, higher energy 3.Rougher vein,longer pulse width . 4.Smoother vein ... width. 2. Thicker hair, longer delay, lower energy 3. Thinner hair, shorter delay, higher energy 4. Denser ...