The first thing you need to do is to buy a hearing aid on the internet.

Not very reliable, hearing aid fitting like glasses, according to the hearing of the elderly as well as the medical history of the fitting, buy hearing aids online, one can not fit, two can not have after-sales protection, hearing aids need to audiologists to regular debugging, the elderly regular review of hearing, hearing aids maintenance and a series of after-sales service, does not meet the hearing of the elderly, one of the elderly will be the impact of the residual hearing, and secondly, the elderly will not be comfortable with the hearing. The old man with will be uncomfortable.