This digital cable descrambler / filter stops anything lower than 54mhz from leaving your receiver. In effect, you will be able to test your pay per view features without being billed. It's your responsibility to call them to let them know which ones you watched since they will never know you watched it. This is the best filter you can get. Beware of other digital cable descramblers! They might be the cheap ones that only cover up to 30mhz and if you have a 42mhz box you'll be out of luck and wishing you would have gotten ours instead. Digital cable descrambler.