Duracell’s hearing aid batteries are colour coded,this particular one is Duracell’s size 10 hearing aid battery, with the yellow colour code. Hearing aids are an essential part of many people’s every day lives, therefore it is essential that the battery that powers them is strong and durable. The Duracell Z10 battery is an ideal choice therefore, it provides an exemplary reliable performance of strong powered long lasted energy. This product also features the useful and clever EasyTab, long tabs, for easy installation (no more fiddling) and these batteries also boast a very long shelf life, due to to the built in Duralock, Power Preservation technology.