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Hearing aids and assistive listening devices are specifically designed to assist individuals with hearing impairments by enhancing their ability to hear sounds clearly. Hearing aids are small electronic devices worn in or behind the ear that amplify sound, making it easier for the wearer to hear conversations and environmental sounds. They can be customized to fit the specific hearing loss of the user, providing personalized amplification based on their needs.

Assistive listening devices (ALDs) encompass a range of tools that improve the signal-to-noise ratio for the listener, which can be particularly helpful in noisy environments. These devices may include FM systems, infrared systems, or loop systems, which transmit sound directly to the user's hearing aids or cochlear implants, thus minimizing background noise.

While sound amplifiers may seem similar to hearing aids, they are typically designed for general sound amplification and are not fitted or calibrated for specific hearing loss conditions, making them less effective for those with specific hearing impairments. Voice enhancers and vocal training tools do not serve the primary function of amplifying external sound for those with hearing loss, as they relate more to speech improvement rather than hearing assistance.