An electrical device worn on the ear to receive radio or telephone communications or to listen to a radio, MP3 player, etc., without other people hearing.
- These day's bookmakers tend to use radio communication and earphones to keep things secret, so it's becoming a dying art.
- Fans are given small radios with earphones so they can listen to the ESPN commentary.
- Some states in the US have already outlawed the use of any kind of earphones and listening devices while driving or riding a bicycle.
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