California Proposition 65

WARNING:  This product contains one or more chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.

This is to apprise you of a California law called Proposition 65, which requires that a special warning be placed on certain products sold in California. Proposition 65 requires warnings on products that contain certain chemicals that the State of California has determined may cause cancer and/or birth defects or other reproductive harm, if those products expose consumers to such chemicals above certain threshold levels that are designed to protect public health.
Mastercool cares about the safety of its customers, and, in an abundance of caution, wants to point out that this Mastercool product may fall into this category.