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Title: Does what it says.
Review: I use a Cables To Go modulator to take the RCA output of my Geovision CCTV system and put all my cameras on all the TVs in my house.When I switched cable companies, I couldn't find a channel to continue to make this work.This thing did exactly what it says it does. I put it inline before the modulator and was able to program it to use channel 77.Works. Get it if you need it. Other channel blocks (frequencies) are available.
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