Pure Fit uses IPL (intense pulse light) to help break the cycle of hair growth without damaging the skin. Light energy from the device is transferred through the skin’s surface and is absorbed by melanin present in the hair shaft. The absorbed light energy is converted to heat energy (below the surface of the skin), which disables the hair follicle preventing further growth.Pure Fit also comes with a detachable precision head that is perfect for smaller, tricky areas (like upper lip, fingers, and toes). Using the precision head will slow your device down a little, so we only recommend using when needed, to ensure you get the fastest treatment possible.