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Telecoils, also known as T-coils, are specialized components found in many hearing aids and cochlear implants that pick up electromagnetic signals from compatible sound sources, such as hearing loop systems. The statement that they can function without the hearing aid's microphone is true because a telecoil operates independently of the microphone. When a telecoil is activated, it bypasses the microphone and directly receives sound from sources that emit magnetic signals, such as loop systems in theaters or places of worship, allowing for clearer sound without background noise interference.

In contrast, the other statements do not accurately represent how telecoils work. Telecoils do not amplify all surrounding sounds; rather, they focus on the magnetic signals, filtering out extraneous sounds. Their use is not confined to classrooms; telecoils are beneficial in various environments, including theaters, churches, and other public spaces. Furthermore, they do not require a direct line-of-sight for communication, as the electromagnetic signals can be received even when there are obstacles between the telecoil and the source. This makes telecoils a versatile tool in assistive listening technology.