These Zinc Air button batteries are specifically designed for hearing aids including the modern wireless models (those that connect directly with smart devices) and are colour coded for easy recognition. As zinc air batteries are air-activated a factory seal has been placed on them inorder for them to remain inactive until it comes to be used. Once peeled, oxygen interacts with the zinc in the battery and in affect turns it on. To get the best performance from the battery, wait one minute after removing the battery to fully activate it before placing it in your hearing devi