Hearing aid features Hearing aids are far more technologically advanced than even a decade ago. Some of today’s devices essentially function as smartphone headsets. You can take calls, stream music and podcasts, and even track health metrics with your hearing aids. Those high-tech features are nice, but they drive up the cost of hearing aids. You can save money by choosing only the features you really need. Most hearing aids have a combination of the following popular features: Multiple channels to adjust the volume of certain frequencies, such as high-pitched or low-pitched sounds, based on your specific type of hearing loss