Z-Rad Radiation Blocking iPhone 4 and iPhone 4S Silicone Case - (Black)
Your mobile phone emits RF energy in a 360 degree radius from the antenna when you're on a call. There is a significant percentage of this RF energy being absorbed into your head called SAR (Specific Absorption Rate). The purpose of the Z-Rad case's design is to redistribute the strength of the transmitted RF signal that comes from the phone away from the users head, significantly reducing SAR levels by up to 95% below the FCC limits!