Electone Model 150-A Behind-the-Ear Hearing Aid The Electone Model 150-A behind-the-ear hearing aid was manufactured by Electone, Inc., of Winter Park, Florida in 1967. It contained an integrated circuit (IC). |  | Click picture for larger view | | | | | | |
| Rear view of the Electone Model 150-A showing the battery door (left) and volume control (right). The battery door served as the on-off switch.
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| Side view of the Electone 150-A hearing aid showing the swing-up battery door. This hearing aid took a No. 675 battery. |  | Click picture for larger view | | | |
| Bottom view of the Electone 150-A hearing aid showing the downward-facing microphone port (bottom center). |  | Click picture for larger view | | | |
| Side view of the Electone 150-A hearing aid showing the model number. |  | Click picture for larger view | | | |
| Outside bottom view of the Electone 150-A hearing aid showing the serial number—44648. |  | Click picture for larger view | | | |
| Side view of the Electone Model 150-A showing its size. (Ruler increments are 1/16".)
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