Imposing roughly the same cautionary standards for cellphones as for fatty food or sugary soda, this city -- never shy about its opinions -- voted on [June 15] to require all retailers to display the amount of radiation each phone emits. The law -- believed to be the first of its kind in the nation -- came ... amid opposition from the wireless telephone industry, which views the labeling ordinance as a potential business-killing precedent. But the administration of Gavin Newsom, the city's ... mayor ... called the vote a major victory for cell phone shoppers' right to know. Under the law, retailers will be required to post materials -- in at least 11-point type -- next to phones, listing their specific absorption rate, which is the amount of radio waves absorbed into the cellphone user's body tissue. These so-called SAR rates can vary from phone to phone, but all phones sold in the United States must have a SAR rate no greater than 1.6 watts per kilogram, according to the Federal Communications Commission, which regulates the $190 billion wireless industry.