Specific absorption rate (SAR) is a measure of the rate at which energy is absorbed by the human body when exposed to a radio frequency (RF) electromagnetic field; although, it can also refer to absorption of other forms of energy by tissue, including ultrasound. It is defined as the power absorbed per mass of tissue and has units of watts per kilogram (W/kg).

The SAR rating of each phone model is being displayed on mobile phone packaging, which will enable users to select phone which have lower SAR value. Try *#07# to check SAR value of your Handset.