• Lithium coin batteries 3V CR2032 • 3-in-1 Child Shield safety system with Colour Alert, bitter coating, and child-resistant packaging • Colour Alert technology that stains the mouth blue upon contact with saliva to indicate possible ingestion • Non-toxic bitter coating on each battery helps prevent accidental ingestion • Reliable operation in extreme conditions with temperatures from -30 to 60 degrees Celsius • Long-lasting power with a shelf life of up to 12 years