Crystal singing bowls at 432Hz for busy, active people who want long, restful sleep to recharge. Crystal singing bowls ring softly and fade into one another in a slow, spacious sound bath tuned to 432Hz, running for four and a half hours. Press play as you get into bed, keep the volume low and steady, and let it run while you sleep. Good, unbroken rest is the simplest way to wake up with more energy for a busy day. (A relaxation aid, not a medical treatment.)