|Telephone Amplifiers and Amplified Telephones
Devices that can be added to an existing telephone to increase the volume or telephones with amplifiers built-in to increase the volume. Often with tone adjustment, as well.Signaling Devices
Devices that amplify the sound of the ring of the telephone, or doorbell, or that replace the ring with a light.Personal Amplifiers
Devices for one-on-one or small group communication that increase the volume of the conversation.
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