you can listen to mp3 from your phone ,or listen to call which receive calls .

You can now stream music, phone calls and other audio directly from compatible Android devices to J10 Hearing Aids.
All without needing an intermediate device to connect the units. Thanks to Bluetooth Low Energy technology, you can stream all day while preserving battery life. This is a challenge for the traditional Classic Bluetooth streaming currently available.

It should also work with Apple Iphone ,just need get license from Apple.inc

This feature normally only exists in high end hearing aids like Resound ,Phonak,Starkey,etc.we bring this feature to our OTC J10 hearing aid