Working principle of natural wake up lamp: When it's time to approach the alarm, the natural wake up light gradually increases in intensity, which triggers the release of hormones (complicated reaction ). While still sleeping, let the body get ready to get up. The light intensity will reach the brightest when the alarm clock rings. At this time, it will not be uncomfortable to get up with the bright light and the alarm clock music Product Description: 1.Simulation sunrise wakes you up gradually 2.Gradual sunset help you to fall asleep 3.Bedside lamp with 10 brightness settings 4.LED colored mood light create fascinating atmosphereLED 5.LED display with 2 brightness setting 6.Time display in 12\/24 H mode 7.Dual alarms for wake time and sunset time 8.Six natural sounds and FM radio can be selected as alarm sound 9.Snooze function 10.FM radio 88-108mHZ 11.Bulit-in 9 warm white LED and 9 RGB LED 12.Supply:by 2*AAA battery(excluded) or Mirco usb cable(included) or adaptor(included) Power supply :2*AAA batteries (not included) or MIRCO USB cable (included) or plug (included) \