Denver CRL-340NR is a versatile alarm clock with many features to help you wake up refreshed and on time. It features a sunrise simulation, which gradually increases the light intensity in the 30 minutes before your alarm goes off, mimicking a natural sunrise. You can also set a sunset simulation, which gradually dims the light in the 30 minutes leading up to your desired bedtime. The alarm clock also includes six nature sounds to choose from, as well as a traditional beep alarm. You can adjust the volume of the alarm from 00 to 15.