Feature: 1. 99.9% Light Blocking: These protective glasses can effectively block 99.9% of destructive blue and green light, sending signals to relax your brain, ensure deep and restorative sleep. 2. Sleep Aid Glasses: These sleep aid glasses can bring you a continuous sleep cycle, cultivate a healthier life style, effectively solve sleep deprivation and other health problems. 3. 2100nm Wavelength: This blue light blocking glasses have a protective wavelength of 2100nm, avoiding excessive electronic light hazards, reducing eye fatigue, improving overall eye health. 4. Applicable People: These sleep aid glasses are very suitable for people who frequently travel and work shifts, helping to reconnect sleep modes and improve time differences. 5. Durable Material: This protective glasses are made of excellent PC material, lightweight and durable, with good corrosion and aging resistance, and has a long service life. Specification: Item Type: Sleep Aid Glasses Material: PC Protective Wavelength: 2100nm. Package List: 1 x Protective Glasses 1 x Storage Box 1 x Eyeglass Cloth