San Francisco supervisors today will take a second and final vote on an ordinance proposed by Mayor Gavin Newsom to require stores to tell customers how much radiation is being emitted by the cell phones they’re selling.

The board approved the measure at an initial vote last week.

The legislation would require retailers in the city to post information about a cell phone’s specific absorption rate, a federal rating of the amount of radio frequency energy absorbed by the head or body from use of the phone.

The ordinance cites the need for “informed purchasing decisions” for consumers.

If approved, a phased-in implementation of the law would begin next February.

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