Maxell is the world's leading manufacturer of mercury-free, environmentally friendly watch batteries. Silver oxide cells are the primary long-lasting cells used in quartz wristwatches, where a high energy density per unit volume and a stable operating voltage are required. To distinguish between mercury-free silver oxide batteries and standard silver oxide batteries, Maxell has stamped the mercury-free variant with a registered logo featuring Hg 0%. Please dispose of used batteries responsibly. Keep out of reach of small children.