Power One Evolution Hearing Aid Batteries - Size 312 - 1.45V Zinc Air Chemical Composition - 6 Batteries per Card IMPROVED BATTERY LIFE - The Power One Evolution Hearing Aid Batteries is the newest development from Power One that features high energy density and more capacity by increasing the battery life by up to 15% than the other Power One hearing aid batteries. THIN FOIL TECHNOLOGY - The sealing on the Power One Evolution Hearing Aid Batteries feature Thin Foil Technology that results in increasing the hearing aid battery's capacity by 15%, giving you an extra 1 to 2 days of battery life. MADE IN GERMANY - The Power One Evolution Hearing Aid Batteries are made with top quality materials and sturdy design in their production plant in Ellwangen, Germany, home to the world's largest and most modern factory for hearing aid batteries. High Capacity and Durability due to proprietary VARTA technology - Long Tabs on Batteries for ease of use - Power One Comfort Packaging with Quality Seal & Double Layer 100% FSC Certified Cardboard The Power One Evolution Hearing Aid Batteries is the newest development from Power One that features high energy density and more capacity by increasing the battery life by up to 15% than the other Power One hearing aid batteries. The extended battery life comes from the stainless steel housing, 3 fold sealing, and high & stable voltage level. The sealing on the Power One Evolution Hearing Aid Batteries feature Thin Foil Technology that results in increasing the hearing aid battery's capacity by 15%, giving you an extra 1 to 2 days of battery life. The Power One Evolution Hearing Aid Batteries are made with top quality materials and sturdy design in their production plant in Ellwangen, Germany, home to the world's largest and most modern factory for hearing aid batteries.