Next month, citizens of Berkeley will see warning labels at point-of-sales at their mobile phone retailers. Under the Right to Know ordinance—passed unanimously in May, 2015 by the Berkeley City Council—retailers must notify customers via a sign or handout that “consumers may exceed the federal guidelines for exposure” to radio frequency radiation by carrying a cellphone in their pants, shirt pocket or bra. The warning adds: “The potential risk is greater for children.”