Hi, My name is Leah Farrell. I live in Canada. I am working for an electronics company. Trying to figure out which emf protection device is the best one is difficult. There are so many devices on the market and they all make pretty big claims. Some protection devices claim to block cell phone frequencies, and some of them do. But this is also possible using other less expensive means like coaxial cables. Emf protection device comparison can help to buy the best device.