Zenith "Pacemaker EPII" Behind-the-Ear Hearing Aid The Zenith "Pacemaker EPII" behind-the-ear hearing aid was manufactured by the hearing aid division of the Zenith Radio Corp in 1973. It contained an integrated circuit. |  | Click picture for larger view | | |   | | |
| Rear view of the Zenith "Pacemaker EPII" showing the M (microphone) T (t-coil) switch (upper left), the hole for adjusting the tone by screwdriver (center left), the closed battery door, which also served as the on-off switch, (center right) and the horizontal volume control (bottom).
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| Side view of the Zenith "Pacemaker EPII" showing the pulled-down battery door. This hearing aid used a No. 675 battery. |  | Click picture for larger view | | | |
| Bottom view of the Zenith "Pacemaker EPII" showing the microphone port in the center of the bottom. It had an electret microphone. |  | Click picture for larger view | | | |
| Side view of the Zenith "Pacemaker EPII" showing its size.
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