It works when carried or worn. I forgot the country, but it seems people actually wear it regularly in a foreign country. It's light and easy to wear. It provides protective performance for personal use and during travel. Recommended for those who display it at home, those who ride the Shinkansen or cars, those who travel frequently, those who often use smartphones and computers, and those who are sensitive to electromagnetic waves. I experienced relief from shoulder stiffness and migraines after wearing it for about 10 minutes.