Reliable replacement: this pack of reliable high-quality size 312 brown hearing aid button batteries is the ideal replacement energy source for hearing aids and hearing aid sound amplifiers. These batteries are also mercury-free making them great for the environment! Zinc air: these batteries with modern zinc-air-technology (1.45V) are air-activated, the sealed Sticker allows them to remain inactive until removed. Once peeled off the battery, oxygen will interact with zinc In battery and activate. Wait at least 1 minute after removing the sticker to fully activate before placing it in The hearing device Pack of 6: This pack of size 312 brown 1.45V hearing aids includes 6 hearing aid batteries. Each button batteries measures 7.8 x 7.8 x 3.6mm and weighs 3G Long life: these hearing aid batteries offer reliable performance and long durability with very good price-performance ratio. The shelf life of these batteries is up to 4 years Perfect size: These size 312 brown hearing aid is most commonly used in the smaller bte devices and very popular for in-the-ear hearing aids