SAR stands for Specific Absorption Rate which is the unit of measurement for the amount of RF energy absorbed by the body when using a mobile phone. SAR values are usually expressed in units of watts per kilogram, it’s also divided in two-part one is head SAR value and another one is body SAR value .as per FCC (Federal Communications Commission) maximum level of radiation permissible. Is 1.60 w/kg.
How to check SAR value in your mobile phone.
Just goto your dial screen and put *#07#, after that you can get your device SAR information.