【20% SMALLER! LONG LASTING BATTERY LIFE】Rechargeable hearing amplifiers are good and all but they are still larger and bulkier. Our hearing amplifiers are even 20% smaller than others and you'll be able to use our hearing amplifiers for an extended period of time without having to worry about the batteries running out. When it does run out, you can easily replace them with common easy to find A10 batteries. Through normal use batteries will last between 4-7 days