CRITICAL! RECHARGEABLE BATTERY LASTS ALL DAY ON A SINGLE CHARGE: Our digital hearing amplifier contains a rechargeable which means that you will not have to constantly change batteries right in the middle of a conversation or suffer from running out of batteries again! Which is why through extensive research, we made it a priority to create a hearing amplifier that has the longest battery life in the industry. Without changing batteries all the time you will be free to do the things you love.LATEST REVOLUTIONARY READY TO USE TECHNOLOGY: The problem with other BTE Hearing amplifiers is they need complicated programing. Our MEDca digital hearing amplifier solves that problem! That's because our hearing sound amplifiers has a digital smart chip which means that no programing is needed and ready to use right out of the box. Never suffer from complicated hearing amplifiers again!