432Hz Cosmic sound is good for meditation, self-healing, Chakra cleansing, relax and even just for a good night sleep. Timer could be set for: 3 minutes, 6 minutes, 9 minutes, 15 minutes, 30 minutes, 45 minutes 1 hour, 3 hours, or 9 hours. A friendly reminder: 1. This App will keeps the screen on in order to keep the Cosmic sound running for long hours.