My hearing aids whistled as well at first but I contacted their customer service and she explained I wasn't inserting them deep enough in the ear. Once I got the fit right the screech completely stopped and the sound quality is actually great for conversation. I didn;t have to use the return policy obviously but the shipping was fast as got them in about 3 days. My advice is read the instructions on the fit before you give up on them. For under $200 you cant beat it compared to the $4k ones my doctor tried to sell me. Very happy customer.
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