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8. Do wireless phone accessories that claim to shield

the head from RF radiation work?

Since there are no known risks from exposure to RF

emissions from wireless phones, there is no reason to

believe that accessories that claim to shield the head

from those emissions reduce risks. Some products

that claim to shield the user from RF absorption use

special phone cases, while others involve nothing

more than a metallic accessory attached to the phone.

Studies have shown that these products generally do

not work as advertised. Unlike "hand-free" kits, these

so-called "shields" may interfere with proper operation

of the phone. The phone may be forced to boost its

power to compensate, leading to an increase in RF

absorption. In February 2002, the Federal trade

Commission (FTC) charged two companies that sold

devices that claimed to protect wireless phone users

from radiation with making false and unsubstantiated

claims. According to FTC, these defendants lacked a

reasonable basis to substantiate their claim.

9. What about wireless phone interference with

medical equipment?

Radio frequency energy (RF) from wireless phones can

interact with some electronic devices. For this reason,

FDA helped develop a detailed test method to measure

electromagnetic interference (EMI) of implanted

cardiac pacemakers and defibrillators from wireless

telephones. This test method is now part of a standard

sponsored by the Association for the Advancement of

Medical instrumentation (AAMI). The final draft, a joint

effort by FDA, medical device manufacturers, and

many other groups, was completed in late 2000. This

standard will allow manufacturers to ensure that

cardiac pacemakers and defibrillators are safe from

wireless phone EMI.

FDA has tested hearing aids for interference from

handheld wireless phones and helped develop a

voluntary standard sponsored by the Institute of

Electrical and Electronic Engineers (IEEE). This

standard specifies test methods and performance

requirements for hearing aids and wireless phones so

that no interference occurs when a person uses a

compatible phone and a compatible hearing aid at the