Last Updated
：2025/12/06
harmonica bug
（ plural ）
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An electronic eavesdropping device (bug) that attaches to a landline telephone and is activated or deactivated by a specific tone. When activated, it prevents the telephone from ringing but activates its microphone to transmit to another telephone at a remote location.
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harmonica bug
Detectives discovered a harmonica bug on the victim's landline that could be activated by a specific tone to silence the ringer while transmitting conversations to a remote telephone.
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Detectives discovered a harmonica bug on the victim's landline that could be activated by a specific tone to silence the ringer while transmitting conversations to a remote telephone.
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