Oticon Model E35 Behind-the-Ear Transistor Hearing Aid The Oticon Model E35 BTE hearing aid was manufactured by Oticon A/S in Denmark in 1985. You can see the microphone grill immediately above the ear hook (left). |  | Click picture for larger view | | |   | | |
| Rear view of the Oticon Model E35 showing the volume control (top), the setting controls with cover removed (middle) and the and the 3-position "M" (microphone), "T" (t-coil) and "O" off switch (shown in off position). The setting controls are: the green screw (top) sets the degree of high frequency amplification (1—gently sloping high frequency loss to 4—ski-slope hearing loss); the red screw (middle) sets the maximum gain (power) from 40 to 80 dB; the black screw (bottom) sets the AGC (automatic gain control) from 0 to 27 dB. |  | Click picture for larger view | | | |
| Rear view of the Oticon Model E35 with the setting controls cover in place.
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| The Oticon Model E35 showing the battery compartment. This hearing aid used a No. 13 battery.
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| View of the Oticon Model E35 showing its size.
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