... combs: Comb A adopts low-level cool laser, together with far infrared, impulse. It has been demonstrated ... the base point, move the comb backward with the laser generator 1cm away from the base point, ... slowly. Remember, you are bathing the hair with laser light, if you move it too fast, ... hair! 2) Easy to use. 3) Complies with International laser product safety standards. 4) Convenient home treatment. No ...