The Edge Series power bracelets from LifeStrength provide a performance advantage that far exceeds the scope of typical balance, strength and flexibility testing. While there are dozens of power bands available on the market today, only one offers the unique benefits of our proprietary ION HEALTH technology, supplying more negative ions than any other power wristbands on the market today.The Edge Series balance bracelet provides the energy stimulation you need in the daytime and the balancing effects of ion normalization to produce restful, rejuvenating sleep at night. It is so comfortable you don"t even realize you are wearing one. What you will notice is the benefits from these impressive power bands.