A metal ring is attached to a transistor radio.
The on/off button is adapted; a small piece of plastic glued to the button enlarges it and makes it easier for the user to handle it unassisted.
The user also glued anti-slip material to the back of the radio so it stays on his lap.
Used it for many years, can easily raise and lower the volume. The radio does not weigh much so it is easy to handle.
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This tip is from 2006