Indiglo is a technology used in watches that provides a backlight for easy reading in low-light conditions. Developed by Timex, it uses electroluminescent technology to illuminate the watch face with a soft blue glow when activated. This feature allows users to see the time clearly, even in darkness. The Indiglo system is activated by pressing a button, which lights up the entire dial. This innovation has made it popular among outdoor enthusiasts and those who need to check the time at night. Its energy-efficient design ensures that the watch's battery life is not significantly affected.