Spot unit was designed for the scalp and small treatment areas. It’s small enough to discreetly carry anywhere you go so you’ll never miss a treatment. Its size and carrying case make it ideal for travel. The scalp is one of the most difficult areas to treat because hair hinders the direct effect of UV irradiation.The specially designed SPOTUVB COMBS allows deep parting of the hair for the better Penetrations and doubles as a distance guide to ensure consistent treatment. It helps to treat small areas.