Product Details60 PowerOne Hearing Aid Batteries, Size 312 Zinc Air Hearing Aid Batteries. (60 batteries Standard dial pack, 10 cards of 6 cells each). VARTA Microbattery with its brand Power One has over 100 years of experience in developing innovative battery technologies. Featuring with its consumer-focused extra long tabs, Power One batteries are manufactured at the world's most up-to-date and biggest production site for hearing aid batteries in Ellwangen/Germany-well recognized for manufacturing quality and detailed precision. Subject to Germany's stringent safety guidelines and quality checks, every cell is tested for its electrical and mechanical characteristics in compliance with its specification. Cross reference size PowerOne P312, Rayovac 312AE, ZeniPower A312. Receive a handy 2 Cell Battery Holder Key chain, FREE with each order. (One Per Order) NOTE: Purchasing multiple cartons in the same order does not qualify for additional keychains.