Kiierr Laser Caps are FDA-cleared, at-home low-level laser therapy (LLLT) devices designed for hair regrowth in men and women. They utilize medical-grade 650 nm laser diodes (models available with 148 or 272 diodes) to stimulate blood flow and awaken dormant hair follicles ts 30 minutes, worn every other day, automatically shutting off afterward. The cap fits under a standard baseball cap, and comes with a portable battery for mobility