Guards EMF are a SCAM!
More info:
https://www.usatoday.com/story/news/factcheck/2020/07/12/fact-check-anti-radiation-shields-do-not-protect-against-emf-emission/5349018002/
https://www.wired.com/story/uvc-sanitizers-antimicrobial-cell-phone-radiation-rfid-blocker-tech-scaremongering/#:~:text=%E2%80%9CFirst%2C%20there%20is,nothing%20at%20all.
https://beatemf.com/emf-scams/
https://www.ftc.gov/news-events/press-releases/2011/06/ftc-offers-tips-help-consumers-avoid-cell-phone-radiation-scams