4A. Important Safety Information 193 Important Safety InformationHeadsets can substantially reduce exposure since the phone isheld away from the head in the user's hand or in approvedbody-worn accessories. Cell phones marketed in the U.S. arerequired to meet RF exposure compliance requirements whenused against the head and against the body.Since there are no known risks from exposure to RF emissionsfrom cell phones, there is no reason to believe that hands-freekits reduce risks. Hands-free kits can be used for convenienceand comfort. They are also required by law in many states ifyou want to use your phone while driving.Cell Phone Accessories that Claim to Shield theHead from RF RadiationSince there are no known risks from exposure to RF emissionsfrom cell phones, there is no reason to believe that accessorieswhich claim to shield the head from those emissions reducerisks. Some products that claim to shield the user from RFabsorption use special phone cases, while others involvenothing more than a metallic accessory attached to the phone.Studies have shown that these products generally do not workas advertised. Unlike "hand-free" kits, these so-called "shields"may interfere with proper operation of the phone. The phonemay be forced to boost its power to compensate, leading to anincrease in RF absorption.Specific Absorption Rate (SAR)Certification InformationYour device is a radio transmitter and receiver. It is designedand manufactured not to exceed the exposure limits forradiofrequency (RF) energy set by the FederalCommunications Commission (FCC) of the U.S. Government.These FCC exposure limits are derived from therecommendations of two expert organizations: the NationalCouncil on Radiation Protection and Measurement (NCRP) andthe Institute of Electrical and Electronics Engineers (IEEE).In both cases, the recommendations were developed byscientific and engineering experts drawn from industry,government, and academia after extensive reviews of thescientific literature related to the biological effects of RF energy.The exposure limit set by the FCC for wireless devices employsa unit of measurement known as the Specific Absorption Rate(SAR). The SAR is a measure of the rate of absorption of RFenergy by the human body expressed in units of watts perkilogram (W/kg). The FCC requires wireless devices to complywith a safety limit of 1.6 watts per kilogram (1.6 W/kg).The FCC exposure limit incorporates a substantial margin ofsafety to give additional protection to the public and to accountfor any variations in measurements.SPH-P100.book Page 193 Thursday, October 14, 2010 2:31 PM