The Charcoal SunRise Clock is derived from medical research on light and human behavior. In the early morning, the biological clock is sensitive to low intensity light. So, waking to a slowly increasing light can result in a smoother, more natural transition to wakefulness. It features an audible back-up alarm, the ability to set dawn and dusk cycles of 15, 30, 60, or 90 minutes, fade to nightlight, adjustable display brightness and more. Comes with hand made opal glass globe. One year manufacturer�s warranty.