Yes! xZubi has been tested, proven, published, and patented all over the world.
You can read the FCC study which shows how having a xZubi attached to your cell phone achieves a significant SAR reduction. And also how having xZubi attached improves brain wave function.
Click below to download the studies:
And Check out these videos showing more proof that they work:
https://www.youtube.com/watch?v=uaOF_yPAYQU
https://www.youtube.com/watch?v=Ik-78DeRegk