Check the listing for details. Sensitive Headphones for Crystal or Regenerative Radios Hi-impedance (1/4" plug). Condition: New. Listed at 35.49 USD. I've sold hundreds of these over the years. They will work in lieu of the old traditional 2 to 4K ohm inductive headphones, for most any radio that has a high impedance audio output. Standard 1/4" mono phone plug.
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