Maxell Hearing Aid Battery are color-coded for easy identification and are specifically designed for hearing aids, including modern wireless models. Because zinc-air batteries are air-activated, they have a manufacturing seal to keep them inactive until they are needed. After being peeled, oxygen reacts with the zinc in the battery, thereby turning it on. Wait one minute after removing the battery to completely activate it before inserting it into your hearing equipment to get maximum performance. When the battery is turned on, it will stay on until depleting the power. These batteries come with a wheel that makes removing the battery from its container a breeze.