Description: Effectively stays your cherished eyes away from harmful blue lights caused by computer, PC, laptop, TV, phone, tablet, etc. The photochromic lens efficiently keeps your eyes from light interference. NOTICE: Place your glasses with the lens facing upwards, otherwise, the lens may be damaged. When glasses are dirty, use eyeglass cleaner or a neutral detergent to rinse them softly, and it is recommended to go to an optician regularly for professional cleaning. Rinse the glasses with a tap and apply 2 small drops of detergent on each lens. Then rinse them off gently with water. Do not use something like a hairdryer to heat your glasses or put them in a hot place, as this may cause them to break. Don't use the cloth to wipe the glasses directly, in that the cloth is for dust-proof use. Specifications: Item Name: Blue Light Blocking Glasses Material: Alloy Color: Black Size:  Glasses : 143*150*45mm/5.6"*5.9"*1.8" Package: 160*70*65mm/6.3"*2.8"*2.6" Product Weight: Approx.77g/2.7oz (Glasses ONLY: 19g/0.7oz) Package Weight: Approx.84.5g/3.0oz Notes: 1. Size information is just for reference only, please allow 1-2cm (0.4-0.8") differences due to manual measurement, thanks. 2. Item color displayed in photos may be showing slightly different on your monitor since monitors are not calibrated the same. Package List: 1 * Blue-Light Blocking Glasses(1 Pair) 1 * Storage Box 1 * Drawstring Bag 1 * Cleaning Cloth 1 * Test Card 1 * Screwdriver 1 * Blue Light (Random color)