OK now in searching for the best price I have purchased a mx-900 w/ mrf-250 included for a great price. But to my bewilderment i have discovered that there is no serial number. Is this legal??? Why would a product have no serial number.

The remote works pretty well with the old mrf-100 that I have except I cannot get the remote to operate the volume of the TV even when trying to learn it from the tv remote. But it does not work at all with the mrf-250 that came with it? Am I not setting the RF controls properly?

How do I use the RF addressing feature??