Dual Frequency IR Receiver
This is needed only if you have a HD Cable or Satellite receiver that operates at a higher frequency then normally found.
We have seen that some cable boxes like the SA HDTV DVR's and DirectTV H21.
This product is designed and tested to work with the Hidden IR repeater
systems that we sell.
To use just replace the receiver that came with the Hidden Ir system with this Dual Frequency IR Receiver.