RELIABLE REPLACEMENT: This pack of reliable high-quality size 675 blue 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 60: This pack of size 675 blue 1.45V hearing aids includes 60 hearing aid batteries. Each button batteries measures 11.6 x 11.6 x 5.4mm and weighs 10g 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 675 blue hearing aid is most often used in very powerful devices designed to provide the maximum amplification possible, the largest of hearing aid batteries in production today, the 675 can be found powering devices such as bone-anchored hearing aids and super power BTE hearing aids