The Red 635 nm light is used for LLLT acupuncture, acne, eczema, skin ulceration, dermatitis, cuts, bruises, musculoskeletal disorders, scars, and stretch marks. The healing process increases the tensile strength of healed tissue, reduces swelling, increases blood flow, increases lymphatic activity, reduces inflammation and increases cellular metabolism and speeds up the repair process. The results are accumulative. Research demonstrates that a wavelength of 635 Nanometers (one Nanometer is one billionth of a meter) is the frequency of a healthy cell and optimal for healing. Each laser unit is shipped with our exclusive Acutip, 8 disposable Welch-Allyn tips in both 2.75 and 4.25 mm., and 4 dental tips. (Additional disposable tips as well as dental tips are available on our products page.) The unit comes complete with charts for finding acupuncture points and detailed instructions.