DO NOT USE on:- scalp, eyebrows or anywhere near or around the eyes. Use in these areas may permanently damage your eyes.- red, very blonde, grey or white hair. The device is not effective on these hair colors.- nipples, genitals or around the anus. These areas may have a darker skin color and/or greater hair density and using the device in these areas may cause discomfort/pain or injure your skin.- dark brown or black spots such as freckles, birthmarks, moles or warts in the treatment area.- a tattoo or permanent makeup in the treatment area.- beard / facial hair for men.DO NOT look directly into the glass filter or attempt to activate the device toward the eyes. To protect the safety of your eyes and those of individuals nearby, the device will only activate when both skin tone sensors are placed against the skin. If at any time the device activates when both sensors are NOT in contact with the skin, STOP use immediately and contact your retailer. DO NOT USE more than once a week on the same area. This will not speed up the results and may increase the chances of injury to your skin.