Unex Controlonics Corp. model FDS-301. I believe these are radio voice scramblers used by police so people with radio scanners could not understand their transmissions. Used, but look to be in good condition. I have no way to test these and know nothing about them. Two identical units with mounting brackets available. $30 for both shipped in continental US. I do not use Paypal. I prefer payment with a US Postal Service money order.
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