Specific Absorption Rate (SAR), ways to find in mobile devices, its measurement and side effects on human

Wireless communication devices such as mobile phones are increasing rapidly. These devices emits electromagnetic radiations which are harmful for human body. When a person holds or carries mobile device close to head or body, the emitted radiation is absorbed by human tissue i.e. Head and Body. This Electromagnetic radiations emitting from mobile devices absorbed by biological tissue is measured in terms of SAR (Specific Absorption Rate) .Specific Absorption Rate is a measure of rate at which Human body tissue absorbs energy when body is exposed to radiations or ultrasounds. SAR varies from mobile to mobile depending upon the antenna design of the mobile. In this review paper information about SAR like how to find SAR of any mobile, measurement techniques, health issues and precautions are described.