Is it reliable to buy hearing AIDS online?

Although things on the Internet are cheap, hearing AIDS are different from ordinary goods. You can't use it when you buy it back. Hearing AIDS need professional audiometry and fitting before they can be purchased. Because everyone's hearing loss is different and the nature of the loss is different, it is useless to buy a hearing aid casually. No matter how cheap it is, there is no quality guarantee, let alone after-sales. I suggest you take grandpa to a professional fitting center.