New/never used, in original boxes, manuals included, push button 4-wire unit designed for use with tactical switches, uses 4 C-cell batteries, point-to-point telephone line, 2 mile range, signal out. 900-3400 Hz with DTMF digital tone, 90 V 20 Hz ringing signal in, canvas case with shoulder strap included, NSN 5805-00-910-8844.
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