The watchband is not an Apple Watch EMF blocker, it instead neutralizes the EMF radiation from the Apple Watch to minimize its harmful effects, and it supports your body energetically as well. So it is an EMF Apple Watch protector, in that it offers protection from radiation in your Apple Watch (and all other sources), but it is not an Apple Watch radiation blocker, which is good because your watch will continue to function normally (if it was blocking EMF's then your watch would not function). Please see the How page on our website for details on how the technology works, and the Research page for studies demonstrating its effectiveness.