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2. TV Ears - Wikipedia

   en.wikipedia.org/wiki/Tv_ears

   TV Ears Digital is the wireless voice clarifying TV listening device that offers digital connectivity and is compatible with Dolby Digital, SRS, and PCM products. The system is light, weighing in at only two ounces, comes with an adjustable tone control, and ergonomically angled foam ear tips. TV Ears Dual Digital

3. Covert listening device - Wikipedia

   en.wikipedia.org/wiki/Covert_listening_device

   A covert listening device, more commonly known as a bug or a wire, is usually a combination of a miniature radio transmitter with a microphone. The use of bugs, called bugging, or wiretapping is a common technique in surveillance, espionage and police investigations. Self-contained electronic covert listening devices came into common use with ...

4. Assistive listening device - Wikipedia

   en.wikipedia.org/wiki/Assistive_Listening_Device

   The assistive listening device usually uses a microphone to capture an audio source near its origin and broadcast it wirelessly through means of frequency modulation (FM), infrared (IR), an audio induction loop, or another method. The person who is listening may use a wireless Receiver to tune into the signal and listen at their preferred volume.

5. ERIC - Education Resources Information Center

   files.eric.ed.gov/fulltext/ED594524.pdf

   ERIC - Education Resources Information Center

6. ERIC - ED438670 - The Role of Assistive Listening Devices in ...

   eric.ed.gov/?id=ED438670

   Information is provided on aspects of ALDs, including: the different types of ALDs; frequency modulated (FM) systems; soundfield amplifications systems; induction loop systems; benefits of using assistive listening devices (such as portability and usefulness in classroom or small group); and strategies for using assistive listening devices ...

7. Learning through Assistive Devices: A Case of Students with ...

   files.eric.ed.gov/fulltext/EJ1210345.pdf

   ed system, and loop system are the hearing assistive tools. Alerting DevicesAlerting. devices are to assist the persons with hard of hearing and deaf from long ago. These devices use the sound and visual amplificatio. or vibration techniques for alerting the individuals with hearing impairment. Vibrotactile.