You have to get a tv messenger or a caller tv device that goes inbetween the composite video(Dtivo->caller tv->tv or Dtivo->HT receiver->caller tv->tv) feed to the tv. If you use s-video there is a cable that you can buy that will covert to composite at the caller tv. To get the cable you have to buy it from the caller tv mfg. I have the tv messenger and it works great and comes with a remote. It also stores up to 99 numbers. You can buy them for around $40 on E-Bay.