The rainbow backlight adds a cool and beautiful aesthetic to the keyboard and allows for easy usage in the dark. The big print letters and slightly spaced keys reduce the chances of hitting the wrong key, making it suitable for the elderly, visually impaired individuals, schools, special needs departments, and libraries. The KOPJIPPOM Backlit Wired Keyboard is a perfect choice for those who require large print keys and a colorful backlight. This product has a rating of A.* What does this rating mean?