Improve your mood with the power of sunlight! This wonderful Yuma Lite acts as a light therapy visor. If cloudy days get you down, let Yuma Lite give you the boost you need. If worn for 30 minutes a day, most users experience improvement in their energy level and mood. It fits comfortably on your head. Wear it while exercising, cleaning or just relaxing. This portable sun therapy light requires 3 AAA batteries.