1.58 W/kg head, but .89 W/kg body. For instance, the X has a 1.43 head, and 1.41 body; Droid 2 1.49 head 1.50 body...so on your body the D2G has a lower specific absorption rate opposed to the X and 2, but on your head it's higher. I honestly hardly ever make actual phone calls so i'm not worried and nothing has been proven *yet* about cell phones causing health problems like brain cancer