The Ceretone hearing app bring simple and powerful control to your Core One OTC hearing aids.You can customize the sound anytime anywhere.We’ve made it really easy for you to control your Core One OTC hearing aids and hearing experience by using the Ceretone app on your mobile device to do the followings:·Customize and control your hearing aid settings for your specific needs with the touch of your smartphone.·selecting programs for multiple listening enviroments.·Control the volume of your hearing aids.Please note, The Ceretone app is only to be used by people above the age of 18, and for those with Core One OTC hearing Aids.