528 hz Breathing Necklace, Anxiety Necklace, 528 hz Whistle Breathing Necklace for Meditation Tuning Tools, Mindful Calming Stress Relief for Women, Men

Really cool piece, but after a few weeks something sounds lose inside

We tested the frequency with my husband's phone and it came up as 526hz. That's really close and honestly, better than I was expecting for the price. Plus, to be fair, I'm not certain of the accuracy of the system we used to test it, so it very well could be 528 and the test could be slightly off. Either way I'm happy with it and it will work for what I purchased it for.