The Qi Shield products are revolutionary futuristic products that create a taurus field of negative ions around the product that completely disables the harmful effects of the positive ions produced by EMFs and RFs, including 5G frequencies. Backed by double-blind scientific studies. The Qi Shield creates a protective field of 225 sq ft; the Qi Home is 2250 sq ft. The product will last for 15 years before it deteriorates. Needs no maintenance whatsoever. I love mine!