Driver's alert glasses are designed for individuals who may need help staying awake while driving. Should user become drowsy and nod off, they sound a warning alarm when user lowers head. Yellow-tinted lenses reduce glare and help user to see better in low light. Can be used with or without the alarm. MATERIALS: polycarbonate frames. COLOR: Black. SIZE: Measures approx 5-3/4 inches lens to lens. Arms approx 5 inches L X 7/8 inches H.