How it Work: Radiation shield sticker is made of radiation protection film and negative ion film, releasing negative ions that neutralizes positive ions produced by electronic devices, protecting our health from EMF radiation Reduce Radiationblocking radiations from mobile phones is as easy as sticking a radiation protection shield on your mobile Easy to Use: You can stick EMR sticker easily to the back of your cell phone and other electronic devices. The EMF radiation shield does not degrade It has very long service life, no need to replace it yearly, and it will serve you for a long time Wide Applications:The Anti radiation sticker can not only be used on cell phone,but also be used as an EMF neutralizer on any other electronic device such as laptop tablets computers