Zenith "Challenger" Eyeglass Hearing Aids The Zenith "Challenger" eyeglass hearing aids were manufactured by the Hearing Aid Division of the Zenith Radio Corp. in 1958. This hearing aid used 3 transistors. Each temple-piece contains a separate hearing aid. |  | Click picture for larger view | | | | | | |
| Top view of the Zenith "Challenger" eyeglass hearing aids. Note the volume controls at the top of the bend of the temple pieces.
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| Outside view of the Zenith "Challenger" temple-pieces. The white nubbin just ahead of the bend in the temple-pieces is where the ear mold tube attaches. |  | Click picture for larger view | | | |
| Close up of the end of the right temple-piece showing the microphone port (hole near top). |  | Click picture for larger view | | | |
| Close up of the end of the right temple-piece showing the opened battery door. The Zenith "Challenger" used a 625 mercury "button" battery. Note the volume control on the top of the temple piece (right side).
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