help with a / b?

I asked what I thought was aa / b cor change my cable box and television and is a 2-way coaxial cable CATV f button switch. this is what is http://www.abccables.com/200-315.html. so its got the 3 points at the top where I figured I plug the cable from the wall but it does have teeth, then connect the cable to the cable box. please, how the hell does this work

the center is the sign out, and outsiders are the inputs.

Kabel-X Coax Core Extraction

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