Red Light Therapy Cap for Head 660nm 830nm Gray Unisex Light Therapy Hat. Schmosley sells the same units for $699 a unit it's no use look it up and check it out for yourself. Bosley Sells for $450. All the tech, far lower price. My hair is coming back, I am doing a few things at once, so I can't tell you exactly that these caps are the difference makers, but my hair is coming back and these are one of three things that i have done, no plug, natural. Priced to Sell!!!!