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MFJ Enterprises Original MFJ-557 Deluxe Morse Code Practice Oscillator Straight Key w/Volume Control
MFJ Enterprises Original MFJ-557 Deluxe Morse Code Practice Oscillator Straight Key w/Volume Control
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Deluxe Morse Code Practice Oscillator, Has Volume Control, Tone Control and a Built In Speaker.
Built In Straight Key Can be Removed for Use On A Transmitter. Requires 1 Optional 9V Battery, also can be used with an Op...

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Product Review

Deluxe Morse Code Practice Oscillator, Has Volume Control, Tone Control and a Built In Speaker.
Built In Straight Key Can be Removed for Use On A Transmitter. Requires 1 Optional 9V Battery, also can be used with an Optional AC adapter too! ( 9v Battery or AC adapter not included).

  • The MFJ-557 Deluxe Morse Code Practice Oscillator runs on a 9 volt battery (not included) or 110 VAC. It measures 8 1/2 x 2 1/4 x 3 3/4 inches. It comes with MFJs famous one year No Matter What warranty.

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