By treating once every two weeks, you are closer to your goals of smoother, silky skin. Works effectively on light to medium skin and medium to dark hair. Prep the skin by cleansing, shaving, and towel-drying. This will allow the laser treatment to be most effective since the Tria Laser Precision works on the hair inside the follicle, under the surface of the skin. Unlock the laser by locating the skin sensor (red light) on the device base and hold it against the skin you wish to treat. This will ensure that it is suitable to use on your skin tone. If the Tria Laser Precision is safe for your skin tone, the device will emit a series of beeps and unlock. If the lock icon is still visible and you do not hear a series of beeps, then it may not be safe for you to use the Tria Laser Precision. The sensation of the Tria Laser Precision varies, depending on the person and treatment area. Start at a low treatment level (one or two) and then increase by one treatment level at a time until you've reached the highest treatment level comfortable to you. The higher the treatment level, the faster and better the results. Establish a treatment area and place the laser tip on the area of skin you wish to treat, making sure that it is flat on your skin. Hold the laser tip in place until you hear two beeps. After the beeps, just lift and place the laser tip on skin so that it overlaps the previous area by about one fourth of an inch. Make sure that the laser tip slightly overlaps the area that you just treated. Precautions: It will not work on darker skin tones or grey, blonde, and red hair. It is designed to work on fair to light brown skin tones and light brown to black hair. After first treatment, you may experience mild redness that should quickly dissipate within 24 hours. The Hair Removal Laser should not be used by or on anyone under the age of 18. The use of the Hair Removal Laser on or by children has not been studied and could result in serious injury. Tria Hair Removal Lasers are also not suitable for use on tattooed skin: tattoos, dark brown or black spots (such as large freckles, birthmarks or moles). Dark skin may absorb too much laser light, which can injure the skin.