Electromagnetic Radiation (EMR) Devices / Reducers ! Is it really working ? How does it works?

I have a questions and concerns about Electromagnetic Radiation (EMR). Is there a way to reduce it? Is this EMR really affecting us (what I mean is our health) on daily and routine basis? 

I saw this device at one of the exhibition recently, with the name brand name of PowerLink.

Welcome any sharing, comments and reply.

Best regards,