REPLACEMENT ENGLISH US KEYBOARD STICKER WITH FLUORESCENT LETTER ON BLACK BACKGROUND It uses reflective technology which reflects light coming from your monitor off the stickers, allowing you to use your keyboard even in the dark It's not "Glowing"! it's Fluorescent Color, so you'll need some light to make the letters visible (ex:monitor light) It is made from high quality, environmentally conscientious materials It can be used on any standard keyboard or laptop. It helps people with poor sight see the letters better.