【Reduce Eyestrain & Sleep Better】：Cheerwe blue light computer screen protector only filter harmful blue light（380-455 nm). NOT like other blue light filter, we don’t filter beneficial blue light（455-500nm), Beneficial blue light boosts alertness, helps memory and cognitive function, and elevates mood. Also, beneficial blue helps regulate circadian rhythm - our natural wakefulness and sleep cycle. | 【Anti Blue Light & Anti UV】：Cheerwe blue screen protector for computer can filter the HARMFUL blue light with the wavelength between 385-445 nm, and release the BENEFICIAL light with wavelength above 445 nm. Advanced Blue Light Blocking Technology protects your eyes, sleep, and skin from the negative effects of blue light overexposure. 99% harmful UV can also be filtered by screen protector. | 【Easy to Install & Bubble Free】：Very Easy to Install, after cleaning your monitor just remove the films on both side of the computer screen blue light blocker. Hang the protector on your monitor. Paste- free and bubble free. It also can be removed at any time and hung on other computers for use. | 【High Light Transmission】: Cheerwe blue light monitor screen protector is made of High Light Transmission Acrylic, it can effectively prevent screen from dust and scratch. Perfectly works in office / home for student, OL, gamer and programmer. | 【You Will Get】PACKAGE INCLUDES: 1 Monitor Blue light filter, 1 cleaning kits, If you have any problems during use, please contact us, we will do our best for you!