Harnessing Nikola Tesla's secret code is easy. Just listen to these 369 Hz + 333 Hz + 666 Hz + 999 Hz tuning forks and feel their power! Includes waterfall sounds for extra relaxation. "If you only knew the magnificence of the 3, 6 and 9, then you would have a key to the universe." — Nikola Tesla Angel Number 333 Hz: 333 is associated with growth, expansion, awareness, creativity, and divine guidance. Angel Number 666 Hz: Despite the negative connotations of 666 in some belief systems, as an angel number, 666 is associated with balance, harmony, and spiritual integration. Angel Number 999 Hz: 999 is associated with completion, endings, and the end of a cycle. It inspires you to welcome fresh starts and let go of what no longer serves you.