Wake up naturally with a wake-up light and colored sunrise. Inspired by nature's sunrise the Philips Wake-up light uses a unique combination of light therapy and sound to wake you in a more natural way. The color of the morning light changes from soft dawn reds through warm orange to bright yellow light. Developed with Philips’ Clinical Sleep &- Respironics knowledge and 100+yrs of Lighting expertise. Frequency is 50/60 Hz.