Red Light Scalp Massage Comb, Vibration and Oil Applicator

Red light for the scalp at the price of a haircut. Kneading vibration, a red LED band, and a reservoir that walks serum down to the roots instead of leaving it on your fingers.

Low-level light for thinning hair has the best consumer evidence after minoxidil. It also takes months, and this page says so before you buy.