Like many other devices such as TVs, mobile phones and computers, hearing aids too have gone through a major technological revolution, especially in the last few years. Most private digital hearing aids are designed to virtually eliminate feedback and make listening in noisy environments easier and more comfortable. Depending on your lifestyle and listening needs you may wish to have hearing aids that are Bluetooth compatible, stream stereo sound from TVs, tablets, and radios or talk on the telephone directly through the hearing aid itself. Re-chargeable hearing aids are also very popular for ease of use. These features are all in instruments that are much smaller, more comfortable and more powerful than ever before.