Hearing aids are electro acoustic devices which one can wear behind or inside one's ear. These machines are intended to amplify and amend the sound for the person wearing them. In the past, devices like ear horn or ear trumpet used to be designed for the collection and delivery of sound energy into ear canal. But with the advent of technology, hearing aids came into existence. Hearing aids comprise of a tube, an ear mold and a case. The case is made of plastic and is small in size so that it can fit behind the pinna or ear. If you want to know more, click Hearing Aids, It is connected to the front with the tube which goes inside the ear as the ear mold. This case consists of the amplification system. By way of this mechanism the sound can be directed electrically or acoustically. The receiver or speaker is placed in the ear mold instead of the case when the sound is directed electrically. The ear mold is prepared on the basis of the wearer's outer ear. This is to make sure that the hearing aid fits comfortably and reduces the probability of feedback. Ear molds are prepared from the right combination of firm and flexible materials. The color of ear mold and case can be customized and the hearing aid can be decorated by using various options. These hearing aids can be used in case of mild as well as severe loss of hearing. These are usually worn by children with hearing problems. The hearing aids come with several benefits. The primary advantage is that there are less chances of earwax and moisture harming the apparatus as the electrical component is located externally outside the pinna. This is the main reason for the hearing aid's durability. These devices can last even for years if one takes proper care. Moreover, the hearing aids can be attached to the assistive listening equipments like FM systems, television sets and stereo. The most recent development is that it can be linked to Bluetooth enabled mobile phones. Another added feature of the hearing aids is can be replaced as the ear mold and case are separately located. Nowadays, hearing aids and telephones are compatible as they can be connected to each other to provide clear and comprehensible sound. The term telephone includes all three kinds of devices cordless, wired and mobile. The hearing aids and telephones can be attached with each other in two ways. Either by connecting the microphone of the hearing aid with the speaker of the phone device or by connecting telecoil, a loop of wire within the hearing aid with the phone's speaker. The microphone used in the hearing aids is omnidirectional which means it can amplify sounds coming from all directions with equal precision. This enables the wearer to catch all the sounds approaching from different directions. This, in turn, improves the ratio of signal to noise which further improves clarity and understanding of speech in sounds. For more info, visit this link.