The Cell Phone / Electronic Device Protection Sticker is designed to attach to your cell phone, tablet, computer or any other electronic device that put’s out EMF (Electro Magnetic Frequencies). 
 
I suggest this one for a router or smart meter: EMF PROTECTION DEVICE FOR SMART METERS AND ROUTERS | My Site
 
 
You can slip it in between your Cellphone and the case for easy removal when changing or upgrading to a new Phone or case,  Or you can peel off the paper backing and stick it to any other device.  This Protection Sticker is infused with a Proprietary Frequency to help  negate the negative effects of your electronic devices on the human body.