PREMIUM ADVANCED 312 BATTERY - Starkey Long Easy Tab 312 Hearing Aid Batteries come extremely fresh straight from manufacturing These are made to order, therefore ensuring you receive the freshest batteries possible.MADE IN THE USA - Starkey Hearing Aid Batteries 312 are manufactured in the USA. In comparison, batteries made in foreign countries have to be shipped for over 1 month before arriving in the USA. Significantly decreasing their battery life.ZINC AIR TECHNOLOGY - Starkey 312 Batteries use 1.45V Zinc Air Technology, providing maximum operating time for the entire pack. Advanced technology hearing aids require the highest quality batteries for the best results.FREE STARKEY KEYCHAIN BATTERY CASE - Receive one Starkey battery case holder for every 60 pack order. These travel caddies are perfect for never losing your hearing aid batteries again.100% SATISFACTION GUARANTEE - Customer experience and ease is our #1 priority. For any reason you are unsatisfied with your purchase, please contact us for a complete exchange.