Just For Men AutoStop is the foolproof way to get rid of gray. Autostop gives you the most natural look. It preserves the subtle variations of your natural haircolor as it targets your grays. You get great results every time. Just For Men Autostop uses AirActive Technology, the first and only oxygen-activated formula automatically stops at the target color. It can't over color. And Autostop is easy to use. There's no mixing and no mess. Just comb it in and rinse it out. Radically easy way to get rid of all of your gray Foolproof, self-timing formula shuts off at target color Preserves the natural variations in your hair No mix, no mess - and just 10 minutes Just comb it in and rinse it out No peroxide, no ammonia .