Motorola MOTOKRZR K1 Guia Del Usuario página 100

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California Perchlorate Label
Some mobile phones use an internal, permanent backup battery on
Perchlorate Label
the printed circuit board that may contain very small amounts of
perchlorate. In such cases, California law requires the following
label:
"Perchlorate Material – special handling may apply. See
www.dtsc.ca.gov/hazardouswaste/
perchlorate."