Unitron UM-60 Behind-the-Ear Bi-CROS Hearing Aid The Unitron BTE Bi-CROS hearing aid was manufactured by Unitron, Inc. It was manufactured in the 1990s and 2000s. It used a #13 battery. A Bi-CROS hearing aid can be used by someone with a hearing loss in one ear and no hearing in the other. |  | Click picture for larger view | | | | | | |
| A hearing aid shell with a microphone (shown right) is placed over the deaf ear and wired across to a hearing aid in the hard of hearing ear in order to pick up sound on the deaf side and transfer it to hard of hearing ear. A spare battery can be kept in the battery compartment on this side.
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| Why the plugs are marked "B" and "C" (in the adjacent pictures) remains a mystery since they are identical. On the hearing side, the sound is amplified by the hearing aid (shown right) for the impaired ear and mixed with the sound from the microphone at the deaf ear. A regular ear mold is worn in the hard of hearing ear (not shown). |  | Click picture for larger view | | | |
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This picture shows the controls for the Unitron UM-60. The volume control is on the left. The black switch (right) is for M (microphone), T (telecoil) and O (off). It is shown in the "M" position.
Between these two controls—normally covered by the sliding door are two screwdriver-accessible potentiometers. The one labeled T (left) is for tone. It can be set between N (normal) and H (high). The one labeled P (right) is for power output. It can be set from 0 to 15. The slot at the extreme right allows the plug to lock in place so it won't accidentally fall out. |  | Click picture for larger view | | |
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